Pub Date : 2023-03-13DOI: 10.1080/02723646.2023.2188635
Snehasish Ghosh, R. Sivakumar
{"title":"Tectono-geomorphic anomaly and its significance for monitoring seismotectonic activity in Lower Tista sub-basin, India, using geoinformatics","authors":"Snehasish Ghosh, R. Sivakumar","doi":"10.1080/02723646.2023.2188635","DOIUrl":"https://doi.org/10.1080/02723646.2023.2188635","url":null,"abstract":"","PeriodicalId":54618,"journal":{"name":"Physical Geography","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49242241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-13DOI: 10.1080/02723646.2023.2189074
Margaret G. Owen, Zachary P. Taylor
ABSTRACT To assess the patterns and severity of disjunction at multiple taxonomic levels for birds, amphibians, crocodilians, and mammals in the western hemisphere, we compiled over 10,100 species ranges and analyzed each range using ERSI ArcMap (10.8.1). After identifying species ranges that were disjunct by 500 km or more, we calculated the mean distance between the disjunct range polygon and primary polygon (d) and relative disjunct area (A) and analyzed disjunction by geographic area and latitude. Birds are the most commonly disjunct taxa (19.3%), followed by mammals (6.4%) and amphibians (2.8%). According to distance and relative area, birds are more severely disjunct than amphibians and mammals. Geographically, South America is home to the largest number of disjunctions across all taxa and latitudinal trends show that disjunction varies by latitude and, coincident with species richness, peaks in the southern tropics. Similarities in disjunction patterns, particularly between mammals and amphibians, suggest that geographic factors, along with dispersal ability, play a key role in creating disjunct distributions.
{"title":"Patterns of disjunction in western hemisphere birds, amphibians, crocodilians, and mammals","authors":"Margaret G. Owen, Zachary P. Taylor","doi":"10.1080/02723646.2023.2189074","DOIUrl":"https://doi.org/10.1080/02723646.2023.2189074","url":null,"abstract":"ABSTRACT To assess the patterns and severity of disjunction at multiple taxonomic levels for birds, amphibians, crocodilians, and mammals in the western hemisphere, we compiled over 10,100 species ranges and analyzed each range using ERSI ArcMap (10.8.1). After identifying species ranges that were disjunct by 500 km or more, we calculated the mean distance between the disjunct range polygon and primary polygon (d) and relative disjunct area (A) and analyzed disjunction by geographic area and latitude. Birds are the most commonly disjunct taxa (19.3%), followed by mammals (6.4%) and amphibians (2.8%). According to distance and relative area, birds are more severely disjunct than amphibians and mammals. Geographically, South America is home to the largest number of disjunctions across all taxa and latitudinal trends show that disjunction varies by latitude and, coincident with species richness, peaks in the southern tropics. Similarities in disjunction patterns, particularly between mammals and amphibians, suggest that geographic factors, along with dispersal ability, play a key role in creating disjunct distributions.","PeriodicalId":54618,"journal":{"name":"Physical Geography","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45230033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-10DOI: 10.1080/02723646.2023.2188632
C. Day, Q. Long
ABSTRACT Rainfall erosivity describes the capability of rainfall to cause soil erosion from a surface during a storm. Currently, the average long-term annual and monthly rainfall erosivity for a location may be obtained from isoerodent maps using a sample of climate stations across the United States (US). However, at the state-scale these measures are sporadic, using rainfall data from an increasingly outdated period, which may not reflect possible changing rainfall erosivity. Focusing on the state of Kentucky, US, we developed rainfall erosivity grids from the state Mesonet system to determine if erosivity has changed spatially and temporally between the original erosivity datasets from the latter twentieth-century and 2011–2020. We further used the Mesonet-derived dataset to develop a GIS-based model to estimate potential soil erosion for croplands during the fallow-season when soil is most prone to erosive storms. Results indicated that monthly erosivity increased across the state between the two periods. Larger increases in erosivity during the latter part of the fallow-season resulted in higher estimated soil erosion from croplands, particularly to the west. These findings may provide guidance in identifying and targeting croplands at greatest potential risk of soil erosion during the fallow-season for additional monitoring, mitigation and management practices.
{"title":"A GIS-based approach for estimating fallow-season cropland soil erosion based on rainfall erosivity","authors":"C. Day, Q. Long","doi":"10.1080/02723646.2023.2188632","DOIUrl":"https://doi.org/10.1080/02723646.2023.2188632","url":null,"abstract":"ABSTRACT Rainfall erosivity describes the capability of rainfall to cause soil erosion from a surface during a storm. Currently, the average long-term annual and monthly rainfall erosivity for a location may be obtained from isoerodent maps using a sample of climate stations across the United States (US). However, at the state-scale these measures are sporadic, using rainfall data from an increasingly outdated period, which may not reflect possible changing rainfall erosivity. Focusing on the state of Kentucky, US, we developed rainfall erosivity grids from the state Mesonet system to determine if erosivity has changed spatially and temporally between the original erosivity datasets from the latter twentieth-century and 2011–2020. We further used the Mesonet-derived dataset to develop a GIS-based model to estimate potential soil erosion for croplands during the fallow-season when soil is most prone to erosive storms. Results indicated that monthly erosivity increased across the state between the two periods. Larger increases in erosivity during the latter part of the fallow-season resulted in higher estimated soil erosion from croplands, particularly to the west. These findings may provide guidance in identifying and targeting croplands at greatest potential risk of soil erosion during the fallow-season for additional monitoring, mitigation and management practices.","PeriodicalId":54618,"journal":{"name":"Physical Geography","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45025403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-01DOI: 10.1080/02723646.2023.2178691
Paula J. Perilla-Castillo, S. Driese, S. Horn, T. Rittenour, M. Nelson, L. McKay
ABSTRACT Two sediment profiles exposed along the floodplain of the Tennessee River provide an excellent opportunity to compare radiocarbon and optically stimulated luminescence dating of fluvial sediments, and to use soil micromorphology as a tool to assess the reliability of these dating methods. The profiles occur as vertical stacks of floodplain soils, buried soils, and fluvial deposits, with the sediments of both profiles indicating an alluvial origin, but with different degrees of soil development. Micromorphological analysis showed pedogenic clay coatings are common in both profiles. These pedofeatures provide evidence of relative age of the deposits, because layered, well-developed, thick clay coatings generally take thousands of years to form. Radiocarbon results indicate that the profiles span from the late early Holocene to late Holocene. OSL dating indicates that one profile is relatively recent (<600 yrs. B.P.) while the other is of late middle Holocene age (3.2 ka B.P. to 5.3 ka B.P.). Clay coatings support the results from OSL because the relatively recent profile has very thin coatings, in contrast with thick, well-developed clay coatings in the older profile. Some of the radiocarbon ages appear to be too old owing to redeposition, but other dates are consistent with soil development and micromorphology.
{"title":"Using soil micromorphology to assess the reliability of radiocarbon and OSL dating of fluvial deposits","authors":"Paula J. Perilla-Castillo, S. Driese, S. Horn, T. Rittenour, M. Nelson, L. McKay","doi":"10.1080/02723646.2023.2178691","DOIUrl":"https://doi.org/10.1080/02723646.2023.2178691","url":null,"abstract":"ABSTRACT Two sediment profiles exposed along the floodplain of the Tennessee River provide an excellent opportunity to compare radiocarbon and optically stimulated luminescence dating of fluvial sediments, and to use soil micromorphology as a tool to assess the reliability of these dating methods. The profiles occur as vertical stacks of floodplain soils, buried soils, and fluvial deposits, with the sediments of both profiles indicating an alluvial origin, but with different degrees of soil development. Micromorphological analysis showed pedogenic clay coatings are common in both profiles. These pedofeatures provide evidence of relative age of the deposits, because layered, well-developed, thick clay coatings generally take thousands of years to form. Radiocarbon results indicate that the profiles span from the late early Holocene to late Holocene. OSL dating indicates that one profile is relatively recent (<600 yrs. B.P.) while the other is of late middle Holocene age (3.2 ka B.P. to 5.3 ka B.P.). Clay coatings support the results from OSL because the relatively recent profile has very thin coatings, in contrast with thick, well-developed clay coatings in the older profile. Some of the radiocarbon ages appear to be too old owing to redeposition, but other dates are consistent with soil development and micromorphology.","PeriodicalId":54618,"journal":{"name":"Physical Geography","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46936728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-10DOI: 10.1080/02723646.2022.2163539
R. Vázquez, T. Carlón-Allende, F. García-Tenorio, F. Mendiola
ABSTRACT During the afternoon of 23 September 2018, a flash flood event occurred at Peribán de Ramos (Michoacán, Mexico). This event was triggered by 2-h precipitation of 58 mm, affecting at least 100 families, damaging 30 houses and killing 8 people. We present the first assessment of this event, for which we carried out stratigraphic descriptions, took sedimentological samples of the deposits and performed numerical simulations with the FLO-2D model to recreate the flow. Our results present a good fit with the flow heights, velocities, and the distribution of the flood zones observed in the field. We additionally performed a flood hazard assessment based on a rainfall frequency analysis for extreme events of 2-h duration at different return periods. Results show that even the 2-year event would reach flow depths >5 m and velocities exceeding 6.5 m/s, causing the overspill of Cutio river, affecting ~1500 inhabitants and avocado farming lands, causing a bigger impact on the population’s incomes and their way of life. We consider that these types of events could become more frequent and of major magnitude due to the change in land cover and land use, obstruction of natural drainages and changes in precipitation patterns in response to climate change.
{"title":"Numerical modelling of a flash-flood event at Peribán de Ramos, Michoacán (Mexico)","authors":"R. Vázquez, T. Carlón-Allende, F. García-Tenorio, F. Mendiola","doi":"10.1080/02723646.2022.2163539","DOIUrl":"https://doi.org/10.1080/02723646.2022.2163539","url":null,"abstract":"ABSTRACT During the afternoon of 23 September 2018, a flash flood event occurred at Peribán de Ramos (Michoacán, Mexico). This event was triggered by 2-h precipitation of 58 mm, affecting at least 100 families, damaging 30 houses and killing 8 people. We present the first assessment of this event, for which we carried out stratigraphic descriptions, took sedimentological samples of the deposits and performed numerical simulations with the FLO-2D model to recreate the flow. Our results present a good fit with the flow heights, velocities, and the distribution of the flood zones observed in the field. We additionally performed a flood hazard assessment based on a rainfall frequency analysis for extreme events of 2-h duration at different return periods. Results show that even the 2-year event would reach flow depths >5 m and velocities exceeding 6.5 m/s, causing the overspill of Cutio river, affecting ~1500 inhabitants and avocado farming lands, causing a bigger impact on the population’s incomes and their way of life. We consider that these types of events could become more frequent and of major magnitude due to the change in land cover and land use, obstruction of natural drainages and changes in precipitation patterns in response to climate change.","PeriodicalId":54618,"journal":{"name":"Physical Geography","volume":"44 1","pages":"503 - 529"},"PeriodicalIF":1.6,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49163063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-29DOI: 10.1080/02723646.2022.2163541
Fawen Li, He Wang, Huifeng Liu
{"title":"Research on the quantitative relationship between topographic features and river network structures","authors":"Fawen Li, He Wang, Huifeng Liu","doi":"10.1080/02723646.2022.2163541","DOIUrl":"https://doi.org/10.1080/02723646.2022.2163541","url":null,"abstract":"","PeriodicalId":54618,"journal":{"name":"Physical Geography","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48854904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-02DOI: 10.1080/02723646.2022.2136600
A. Masseroli, I. Bollati, M. La Licata, M. Pelfini, L. Trombino
ABSTRACT In high-altitude environments, most of the debris-free glacier forelands are increasingly widening and the bare surfaces left by retreating glaciers offer the opportunity to investigate the evolution of soil through time. The main aim of this study is to discuss the applicability of a chronosequence approach in a deglaciated area, by considering the role of different soil forming factors. A study case has been selected (Alpe Veglia, Lepontine Alps), where field and laboratory characterizations were performed along a transect of 12 soil profiles from the proglacial area of the Aurona Glacier to the Alpe Veglia hollow, crossing different age glacial deposits. The results of soil physical and chemical analyses underline a time-trend of soil properties. On the other hand, even if the soil properties variability along the transect can be mainly explained according to the soil chronosequence approach, the data seem to highlight how the various soil forming factors (e.g. parent material, relief, vegetation) influence soil features, partly masking the effect of the time factor inducing a divergence from a traditional chronosequence. In particular, the morphology of the surrounding reliefs, depending on bedrock lithologies and structures, and the geomorphic dynamics seem to affect soil formation and evolution.
{"title":"The relative imprint of forming factors on soil characteristics in a recently deglaciated area: concerns about chronosequences approach","authors":"A. Masseroli, I. Bollati, M. La Licata, M. Pelfini, L. Trombino","doi":"10.1080/02723646.2022.2136600","DOIUrl":"https://doi.org/10.1080/02723646.2022.2136600","url":null,"abstract":"ABSTRACT In high-altitude environments, most of the debris-free glacier forelands are increasingly widening and the bare surfaces left by retreating glaciers offer the opportunity to investigate the evolution of soil through time. The main aim of this study is to discuss the applicability of a chronosequence approach in a deglaciated area, by considering the role of different soil forming factors. A study case has been selected (Alpe Veglia, Lepontine Alps), where field and laboratory characterizations were performed along a transect of 12 soil profiles from the proglacial area of the Aurona Glacier to the Alpe Veglia hollow, crossing different age glacial deposits. The results of soil physical and chemical analyses underline a time-trend of soil properties. On the other hand, even if the soil properties variability along the transect can be mainly explained according to the soil chronosequence approach, the data seem to highlight how the various soil forming factors (e.g. parent material, relief, vegetation) influence soil features, partly masking the effect of the time factor inducing a divergence from a traditional chronosequence. In particular, the morphology of the surrounding reliefs, depending on bedrock lithologies and structures, and the geomorphic dynamics seem to affect soil formation and evolution.","PeriodicalId":54618,"journal":{"name":"Physical Geography","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49283215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-29DOI: 10.1080/02723646.2022.2136594
N. Y. Owusu-Amponsah, J. VanLooy, G. Vandeberg
ABSTRACT Glacial and snow melt in the Wind River Range, Wyoming feed headwaters for the Missouri and Colorado River Systems, covering much of the western United States. Identifying the factors that have the greatest impact on snow and ice melt is important to managing the water resources in this region. This study examined snow and ice albedo, summer temperature and precipitation, and winter precipitation as potential significant factors related to snow and ice area changes. The Mann–Kendall statistical test was used to analyze changes in surface albedo on snow and ice over time (1985 to 2016) as derived from Landsat imagery among 5 basins in the Wind River Range. As well, a stepwise regression analysis was utilized in determining the significance of albedo along with summer mean temperature, total summer precipitation, and total winter precipitation in predicting snow and ice area. Among all the variables, albedo was found to have the greatest significance in relation to snow and ice area change. The significance of albedo on snow and ice melting in the Wind River Range is likely due to a positive feedback effect coupled with possible effects from annual increases in particulates from forest fires and fossil fuel production.
{"title":"Changes in snow and ice surface albedo and its impact on snow and ice area in the Wind River Range, Wyoming, USA","authors":"N. Y. Owusu-Amponsah, J. VanLooy, G. Vandeberg","doi":"10.1080/02723646.2022.2136594","DOIUrl":"https://doi.org/10.1080/02723646.2022.2136594","url":null,"abstract":"ABSTRACT Glacial and snow melt in the Wind River Range, Wyoming feed headwaters for the Missouri and Colorado River Systems, covering much of the western United States. Identifying the factors that have the greatest impact on snow and ice melt is important to managing the water resources in this region. This study examined snow and ice albedo, summer temperature and precipitation, and winter precipitation as potential significant factors related to snow and ice area changes. The Mann–Kendall statistical test was used to analyze changes in surface albedo on snow and ice over time (1985 to 2016) as derived from Landsat imagery among 5 basins in the Wind River Range. As well, a stepwise regression analysis was utilized in determining the significance of albedo along with summer mean temperature, total summer precipitation, and total winter precipitation in predicting snow and ice area. Among all the variables, albedo was found to have the greatest significance in relation to snow and ice area change. The significance of albedo on snow and ice melting in the Wind River Range is likely due to a positive feedback effect coupled with possible effects from annual increases in particulates from forest fires and fossil fuel production.","PeriodicalId":54618,"journal":{"name":"Physical Geography","volume":"44 1","pages":"581 - 599"},"PeriodicalIF":1.6,"publicationDate":"2022-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49173729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-05DOI: 10.1080/02723646.2022.2127477
Z. Mitre
ABSTRACT The goal of this study is to interpret the cross-sectional increases of rinnenkarren systems with the use of analytical model and CFD simulation. In rinnenkarren, water accumulation from the catchment was approximated using an analytical method based on field data. The length of eddies appearing at tributary junctions was studied by CFD in model channels. The results of the analytical and numerical models were compared against morphometrical parameters of rinnenkarren surveyed in the Totes Gebirge (Austria). It is found that there is a relationship between catchment size and channel development. Along small catchments, channel development is random. However, channel development along large catchments is controlled by water concentration. Decrease in the slope angle of the catchment results in an increase in the volume of water entering the channel and development of tributary channels. When water inflow is not concentrated in a single place, several smaller tributary channels emerge. When it is concentrated, only one large-sized and long tributary develops. At the junctions of large tributaries significant vorticity was identified in the CFD models. In addition to the previous model studies, the similarity between the lengths of the simulated vorticity sections and the local field hollowings was revealed.
{"title":"Effects of the tributary channel and water catchment area on rinnenkarren development (Totes Gebirge, Austria)","authors":"Z. Mitre","doi":"10.1080/02723646.2022.2127477","DOIUrl":"https://doi.org/10.1080/02723646.2022.2127477","url":null,"abstract":"ABSTRACT The goal of this study is to interpret the cross-sectional increases of rinnenkarren systems with the use of analytical model and CFD simulation. In rinnenkarren, water accumulation from the catchment was approximated using an analytical method based on field data. The length of eddies appearing at tributary junctions was studied by CFD in model channels. The results of the analytical and numerical models were compared against morphometrical parameters of rinnenkarren surveyed in the Totes Gebirge (Austria). It is found that there is a relationship between catchment size and channel development. Along small catchments, channel development is random. However, channel development along large catchments is controlled by water concentration. Decrease in the slope angle of the catchment results in an increase in the volume of water entering the channel and development of tributary channels. When water inflow is not concentrated in a single place, several smaller tributary channels emerge. When it is concentrated, only one large-sized and long tributary develops. At the junctions of large tributaries significant vorticity was identified in the CFD models. In addition to the previous model studies, the similarity between the lengths of the simulated vorticity sections and the local field hollowings was revealed.","PeriodicalId":54618,"journal":{"name":"Physical Geography","volume":"44 1","pages":"478 - 502"},"PeriodicalIF":1.6,"publicationDate":"2022-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47226736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-03DOI: 10.1080/02723646.2022.2080902
A. Alghamdi, J. Harrington
ABSTRACT The Arabian Subtropical Anticyclone (ASA) plays an essential role in regulating weather systems over the Arabian Peninsula (Arabia) and adjacent areas. A need exists to document specific details of the spatial and temporal climatology of the ASA. In order to identify the monthly ASA position/center, the local maximum geopotential height (gph) should be located at different vertical levels. The common automated method did not work for the ASA in the warm season and an approach involving wind flow patterns was needed. The ASA was better defined in the lower troposphere in the cool season and in the mid- to upper-troposphere during the warm season. The near surface ASA begins in Aug over northern Arabia and migrates southeast until it reaches the Arabian Sea in Feb. Apr is the onset of the middle-troposphere ASA. From May to Aug, this anticyclone moves to the north with increasing height. The upper-level ASA is located over northeast Arabia in May and goes north in Jun and Jul. Seasonal changes in energy fluxes and atmospheric circulation patterns linked with the Asian Monsoon are identified as possible drivers of the temporal changes in the ASA.
{"title":"Spatiotemporal climatology of the Arabian Subtropical Anticyclone","authors":"A. Alghamdi, J. Harrington","doi":"10.1080/02723646.2022.2080902","DOIUrl":"https://doi.org/10.1080/02723646.2022.2080902","url":null,"abstract":"ABSTRACT The Arabian Subtropical Anticyclone (ASA) plays an essential role in regulating weather systems over the Arabian Peninsula (Arabia) and adjacent areas. A need exists to document specific details of the spatial and temporal climatology of the ASA. In order to identify the monthly ASA position/center, the local maximum geopotential height (gph) should be located at different vertical levels. The common automated method did not work for the ASA in the warm season and an approach involving wind flow patterns was needed. The ASA was better defined in the lower troposphere in the cool season and in the mid- to upper-troposphere during the warm season. The near surface ASA begins in Aug over northern Arabia and migrates southeast until it reaches the Arabian Sea in Feb. Apr is the onset of the middle-troposphere ASA. From May to Aug, this anticyclone moves to the north with increasing height. The upper-level ASA is located over northeast Arabia in May and goes north in Jun and Jul. Seasonal changes in energy fluxes and atmospheric circulation patterns linked with the Asian Monsoon are identified as possible drivers of the temporal changes in the ASA.","PeriodicalId":54618,"journal":{"name":"Physical Geography","volume":"43 1","pages":"659 - 679"},"PeriodicalIF":1.6,"publicationDate":"2022-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41347082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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