Polar Science最新文献_第3页

The geology, chemistry and age of the Straumsvola Alkaline Complex, western Dronning Maud Land, Antarctica. The role of liquid immiscibility 南极洲Dronning Maud地西部Straumsvola碱性复合体的地质、化学和时代。液体不混溶的作用

IF 2 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2025-12-01 DOI: 10.1016/j.polar.2025.101305

G.H. Grantham , T. Spell , M.W. Knoper , P. le Roux

The Straumsvola Alkaline Complex in H.U. Sverdrupfjella, western Dronning Maud Land, Antarctica (WDML) consists of four units comprising a Central Layered Zone (CLZ), a Central Outer Zone (COZ), a Mesocratic Zone (MZ) and Mafic layer (ML). The COZ is intruded by the CLZ and MZ. Layering and textures in the CLZ reflect fractionation of cumulate perthite and nepheline with intercumulate liquid from which amphibole, biotite and clinopyroxene crystallised. Amphibole, biotite and clinopyroxene locally form spherical nodules with interdigitating feldspar laths. The ML is included as part of the CLZ, suggested by similar field characteristics and chemical data. Similar textures reflecting early feldspar crystallisation with later intercumulate amphibole, biotite clinopyroxene are seen in all units. The chemical data of the felsic and mafic components don't show linear relationships suggestive of disequilibrium between the mineral assemblages and that they may have formed by liquid immiscibility. The ML is inferred to have formed from expulsion of intercumulate mafic magma through the permeable CLZ upwards by compaction of the felsic cumulates. Isotope data indicate the alkaline rocks are mantle derived, similar to dykes of similar age and vicinity. ⁴⁰Ar/³⁹Ar dates provide ages of ca. 178 Ma for the complex. Whole rock compositions of the alkaline rocks, combined with mineral and Jurassic dyke compositions plot in separate compositional fields, consistent with liquid immiscibility experiments and natural examples. Alternatively contrasting mantle melting would be required in the genesis of these rocks to produce synchronous peralkaline and tholeiitic melts in the same localities, combined with fractional crystallization.

南极Dronning Maud Land西部H.U. Sverdrupfjella的Straumsvola碱性杂岩（WDML）由中央层状带（CLZ）、中央外缘带（COZ）、中游带（MZ）和基性层（ML）四个单元组成。COZ被CLZ和MZ侵入。CLZ的层序和结构反映了堆积的花青石和霞石的分馏作用，堆积间的液体形成角闪孔、黑云母和斜辉石结晶。角闪石、黑云母和斜辉石局部形成球形结核，长石板条互指。根据相似的场特征和化学数据，ML被包括在CLZ中。在所有单元中都可以看到类似的结构，反映了早期长石结晶和后期的堆间角闪洞，黑云母斜辉石。长英质和镁质组分的化学数据没有显示出线性关系，表明矿物组合之间的不平衡，它们可能是由液体不混溶形成的。推断ML是由堆间基性岩浆在长英质堆积压实作用下通过可渗透的CLZ向上排出而形成的。同位素资料表明，碱性岩系地幔源岩，与相近年龄和邻近地区的岩脉相似。40Ar/39Ar日期为该复合体提供了约178 Ma的年龄。碱性岩石的整体岩石组成，结合矿物和侏罗纪岩脉组成在不同的组成场，与液体不混相实验和自然实例相一致。或者，在这些岩石的成因中，需要对比鲜明的地幔熔融作用，以在同一位置产生同步的过碱性和拉斑岩熔融，并结合分块结晶作用。

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引用次数: 0

Högbomite and associated minerals within magnetite megacryst in pegmatite from West Ongul Island, East Antarctica Högbomite及东南极洲西昂古尔岛伟晶岩中磁铁矿巨晶中的伴生矿物

IF 2 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2025-12-01 DOI: 10.1016/j.polar.2025.101301

Toshisuke Kawasaki

This is a report of the mineral inclusions in magnetite megacryst within pegmatite, cutting the granulite-facies medium-grained pyroxene gneisses from West Ongul Island, Lützow-Holm Complex, East Antarctica. Inclusions involve a monophase or multiphase assemblage that consists of various combinations of anatase, andalusite, biotite, corundum, diaspore, högbomite, hematite, ilmenite, kaolinite, monazite, muscovite, plagioclase, pseudorutile, quartz, rutile, sillimanite, spinel and zircon. These occur as independent minerals, lamellae, seams, sticks on lamella and seam, aggregates along the magnetite–ilmenite boundary, altered minerals and edge minerals of megacryst.

West Ongul magnetite crystallised in pegmatite at around 4 kbar and 680 ℃ under hydrous (

f_{H_{2} O} = 1 0^{- 12} \sim 1 0^{- 11}

bar) and oxidising (

f_{O_{2}} = 1 0^{- 17.8} \sim 1 0^{- 12.5}

bar) conditions. Cooling

P

–

T

path of pegmatite after magnetite crystallisation is estimated to cut through the wet solidus of muscovite granite at around 3 kbar and 650 ℃. Subsequently, the

P

–

T

condition changed to the rutile

⇌

anatase boundary at around 2 kbar and 580 ℃. Then, the

P

–

T

condition reached to the field bounded by the kyanite

⇌

andalusite and diaspore

⇌

corundum + H

_{2}

O phase boundaries, forming diaspore at around 0.5 kbar and 350 ℃, and finally, to the kaolinite stability field around 250 ℃ or less.

本文报道了东南极洲l佐-霍尔姆杂岩西翁格尔岛麻粒岩相中晶辉片麻岩中磁性巨晶岩中的矿物包裹体。包裹体包括一种由锐钛矿、红柱石、黑云母、刚玉、一水硬铝石、högbomite、赤铁矿、钛铁矿、高岭石、独居石、白云母、斜长石、假圆石、石英、金红石、硅线石、尖晶石和锆石的各种组合组成的单相或多相组合。它们以独立矿物、片层、缝、片层和缝上的黏合剂、磁铁矿-钛铁矿边界聚集物、蚀变矿物和巨晶边缘矿物的形式存在。West Ongul磁铁矿在含水（fH2O=10−12 ~ 10−11 bar）和氧化（fO2=10−17.8 ~ 10−12.5 bar）条件下，在4kbar和680℃的温度下结晶为辉晶岩。估计磁铁矿结晶后伟晶岩的冷却P-T路径在3 kbar和650℃左右穿过白云母花岗岩的湿固相。随后，在2 kbar和580℃左右，P-T条件转变为金红石+锐钛矿边界。然后，P-T条件达到蓝晶石+红柱石和一水硬石+刚玉+ H2O相界场，在0.5 kbar和350℃左右形成一水硬石，最后达到250℃以下的高岭石稳定场。

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引用次数: 0

Long-term aerosol optical depth analysis and prediction over the Antarctic Peninsula 南极半岛长期气溶胶光学深度分析与预测

IF 2 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2025-12-01 DOI: 10.1016/j.polar.2025.101212

Esra Günaydın , Mahmut Oğuz Selbesoğlu , Mustafa Fahri Karabulut , Işıl Erdoğdu , Beyza Nur Kılıç , Bahadır Çelik , Özgün Oktar , Burcu Özsoy

The Earth's atmosphere is a system that significantly influences weather patterns and climate by regulating the radiation balance. Disturbances in the balance of incoming and reflected radiation filtered through the atmosphere constitute an interaction driving the planet's temperature, atmospheric circulation, and climate mechanism. The polar regions play a crucial role in maintaining the global climate balance due to their influence on atmospheric circulation patterns. In this context, monitoring atmospheric variables and their changes over time is critical for understanding and predicting global climate change. This study investigated the long-term variations of aerosol optical depth (AOD) in Antarctica, a region highly sensitive to atmospheric changes. The research utilized Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua and Terra AOD products across three different-sized areas. The temporal variations of AOD over a twenty-year period were examined on a spatial basis to understand the patterns and trends of AOD. Furthermore, a comparison was conducted using data from the Marambio Aerosol Robotic Network (AERONET) station and satellite-based data. The evaluations were carried out separately using data from the Terra and Aqua satellites, and similar increasing trends in AOD values were observed for both datasets from 2002 to 2022. The correlation between the four-month mean AOD of Aqua and AERONET, as well as Terra and AERONET, was calculated as 0.6488 and 0.6190, respectively. A Seasonal Autoregressive Integrated Moving Average (SARIMA) model was applied to satellite-based data to predict the dataset's behavior in the near future. The predictive analysis based on these datasets indicated that the most appropriate models were SARIMA(3,1,2)(3,1,0)₁₂ for Aqua and SARIMA(2,1,1)(0,1,3)₁₂ for Terra. The root mean square error values derived from predictions based on these model configurations were 0.030 for the Aqua dataset and 0.018 for the Terra dataset, indicating the accuracy of the models in forecasting the respective data. The predictions demonstrated strong agreement with the observed data, revealing a sustained increase in AOD values over time.

地球大气层是一个通过调节辐射平衡来显著影响天气模式和气候的系统。通过大气过滤的入射和反射辐射平衡中的干扰构成了驱动地球温度、大气环流和气候机制的相互作用。由于极地对大气环流模式的影响，极地在维持全球气候平衡方面发挥着至关重要的作用。在这种情况下，监测大气变量及其随时间的变化对于了解和预测全球气候变化至关重要。本研究研究了对大气变化高度敏感的南极地区气溶胶光学深度（AOD）的长期变化。该研究利用中分辨率成像光谱仪（MODIS） Aqua和Terra AOD产品在三个不同大小的区域进行研究。在空间基础上，分析了近20 a AOD的时间变化特征，以了解AOD的变化规律和趋势。此外，利用Marambio气溶胶机器人网络（AERONET）站的数据和卫星数据进行了比较。利用Terra和Aqua卫星的数据分别进行了评估，从2002年到2022年，两个数据集的AOD值都有类似的增加趋势。Aqua和AERONET、Terra和AERONET的4个月平均AOD的相关系数分别为0.6488和0.6190。利用季节自回归综合移动平均（SARIMA）模型对卫星数据进行预测。基于这些数据集的预测分析表明，最合适的模型为Aqua的SARIMA(3,1,2)(3,1,0)12和Terra的SARIMA(2,1,1)(0,1,3)12。基于这些模型配置的预测得出的均方根误差值在Aqua数据集为0.030，在Terra数据集为0.018，表明模型在预测各自数据时的准确性。预测结果与观测数据非常吻合，表明AOD值随时间持续增加。

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引用次数: 0

Melting processes of the marginal ice zone inferred from floe size distributions measured with a drone in the southern Sea of Okhotsk 鄂霍次克海南部用无人潜航器测量的浮冰大小分布推断出边缘冰带的融化过程

IF 2 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2025-12-01 DOI: 10.1016/j.polar.2025.101215

Takenobu Toyota , Yuriko Arihara , Takuji Waseda , Masato Ito , Jun Nishioka

In the marginal ice zone, sea ice melts by absorbing heat from the surrounding seawater. Given that for the same sea ice area, total perimeter is longer for smaller ice floes, the information on floe size distribution is essential to predict the melting rate of sea ice. Our study was conducted in the southern Sea of Okhotsk under relatively calm and warm conditions in mid-February 2020. For the first time we used a drone to measure ice floes at a scale of less than a few meters and deduce the melting processes. Our results revealed that the cumulative floe size distribution is represented well by the power law with an exponent of 1.51 for floes larger than 0.9 m, and that each floe geometry has self-similar properties with an aspect ratio of 1.73. For floes below 0.9 m, it was shown that the floe size distribution deviates somewhat from the power law, associated with thermodynamic breakup which is caused by the increase in sea ice porosity. The surface heat budget analysis using the meteorological reanalysis datasets suggests that the efficient heat absorption from the open water and internal melting contributed to this process.

在边缘冰区，海冰通过吸收周围海水的热量而融化。考虑到相同的海冰面积，较小的浮冰的总周长较长，因此，关于浮冰大小分布的信息对于预测海冰的融化速度是必不可少的。我们的研究是在2020年2月中旬相对平静和温暖的条件下在鄂霍次克海南部进行的。我们第一次使用无人机在不到几米的尺度上测量浮冰，并推断融化过程。研究结果表明，对于大于0.9 m的絮体，其累积粒径分布可以用指数为1.51的幂律很好地表示，并且每个絮体的几何形状具有自相似的特性，长径比为1.73。对于小于0.9 m的浮冰，浮冰粒径分布偏离幂律，与海冰孔隙度增加引起的热力破碎有关。利用气象再分析资料进行的地表热收支分析表明，开放水域的有效吸热和内部融化对这一过程起了促进作用。

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引用次数: 0

Mode of occurrence of fracture-filling microcrystalline quartz and Al2SiO5 mineral assemblage in the Sør Rondane Mountains, East Antarctica: Implication for fluid infiltration during retrograde metamorphism 东南极洲Sør Rondane山岩缝充填型微晶石英及Al2SiO5矿物组合赋存方式：逆变质期流体入渗意义

IF 2 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2025-12-01 DOI: 10.1016/j.polar.2025.101209

Fumiko Higashino , Tetsuo Kawakami , Hayato Ikeda , Tatsuro Adachi , Masaoki Uno

Mode of occurrence of fracture-filling microcrystalline quartz-Al₂SiO₅ mineral assemblage is examined in the Sør Rondane Mountains (SRM), East Antarctica. The microcrystalline Al₂SiO₅ minerals characteristically represent fibrous texture and are identified to be kyanite and sillimanite by Raman spectroscopy. Pelitic gneisses containing such fractures are observed in a wide area of over 50 km in the SRM. The microcrystalline quartz-Al₂SiO₅ mineral assemblage can be formed by acidic aqueous fluid infiltration which removed alkali and alkaline-earth metals in feldspars and cordierite. Such fluid infiltrations possibly took place during exhumation stage at < ca. 560 Ma.

研究了东南极洲Sør Rondane Mountains （SRM）裂缝充填型微晶石英- al2sio5矿物组合的赋存方式。微晶Al2SiO5矿物呈纤维状结构，拉曼光谱鉴定为蓝晶石和硅线石。含有这种裂缝的泥质片麻岩在SRM 50多公里的大范围内被观察到。微晶石英- al2sio5矿物组合可由酸性水渗流去除长石和堇青石中的碱金属和碱土金属形成。这种液体浸润可能发生在挖掘阶段，温度约为560ma。

引用次数: 0

Analysis of mountain glaciers mass loss in Iran's largest glacier region, Takht-e Soleyman, from 1997 to 2023, using the geodetic techniques 1997年至2023年伊朗最大冰川地区Takht-e Soleyman山地冰川质量损失分析，使用大地测量技术

IF 2 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2025-12-01 DOI: 10.1016/j.polar.2025.101240

Neamat Karimi

Despite Iran's predominantly arid and warm climate, its high mountain elevations host glacier regions, with limited knowledge regarding recent climate-driven surface elevation and mass changes. This study addresses the Takht-e Soleyman glacial area, the largest in Iran, analyzing surface elevation and mass balance changes between 1997 and 2023 using topographic data and UAV surveys. The elevation change data analysis emphasizes the overall trend of glacier surface lowering. The results show a moderate glacier thinning rate, averaging −0.34 ± 0.06 m/a, translating to a mass loss of −0.29 ± 0.05 m w.e.a⁻¹ over 26 years, which is lower than the global average thinning rate of −0.48 ± 0.20 m w.e.a⁻¹. The smaller glaciers in the southern part, such as Merjikesh (−0.03 ± 0.007 m w.e.a⁻¹) and Khersan (−0.24 ± 0.04 m w.e.a⁻¹), displayed more stable mass balances compared to northern glaciers like Alamkouh (−0.31 ± 0.05 m w.e.a⁻¹). A general trend of increased thinning with altitude was observed, with the highest thinning rates in high-altitude accumulation zones. Specifically, the average gradient of lowering for all glaciers in the Takht-e Soleyman region is around −0.06 m/a per 100 m. Climatic trends derived from ERA5 reanalysis data indicate no statistically significant changes in precipitation, snowfall, or temperature, suggesting that regional climate variability is not the primary driver of mass loss. However, snow persistence (derived from MODIS satellite images) exhibited a mean decline of 5 % across the region, with reductions of up to 15 % in critical accumulation zones. Local surface features, including ice cliffs (−0.77 m/a), supraglacial lakes (−0.69 m/a), and debris-free areas (−0.61 m/a), exhibit the highest surface elevation change rates, significantly exceeding the rates observed in debris-covered areas (−0.31 m/a). These findings emphasize that local surface characteristics, rather than climatic variability, are the critical drivers of glacier mass loss in the region. This study enhances understanding of glacier changes in Iran's central Alborz Mountains, highlighting the need for continuous monitoring and regional assessments to better grasp climate change impacts.

尽管伊朗主要是干旱和温暖的气候，但其高海拔地区拥有冰川地区，对最近气候驱动的地表海拔和质量变化的了解有限。本研究针对伊朗最大的Takht-e Soleyman冰川区，利用地形数据和无人机调查分析了1997年至2023年间地表高程和物质平衡的变化。高程变化数据分析强调了冰川表面降低的总体趋势。结果表明，该地区冰川的减薄速率为中等，平均为- 0.34±0.06 m/a， 26年的质量损失量为- 0.29±0.05 m w.e.a−1，低于全球平均的- 0.48±0.20 m w.e.a−1。南部较小的Merjikesh冰川（- 0.03±0.007 m w.e.a−1）和Khersan冰川（- 0.24±0.04 m w.e.a−1）的物质平衡比北部的Alamkouh冰川（- 0.31±0.05 m w.e.a−1）更为稳定。随着海拔高度的增加，总体上有减薄增加的趋势，在高海拔堆积区减薄率最高。具体而言，Takht-e Soleyman地区所有冰川的平均下降梯度约为- 0.06 m/a / 100 m。从ERA5再分析数据得出的气候趋势表明，降水、降雪或温度在统计上没有显著变化，这表明区域气候变率不是质量损失的主要驱动因素。然而，雪持久性（来自MODIS卫星图像）在整个地区平均下降了5%，在关键积累区减少了15%。冰崖（- 0.77 m/a）、冰上湖（- 0.69 m/a）和无碎屑区（- 0.61 m/a）等局部地表特征地表高程变化率最高，显著超过碎屑覆盖区（- 0.31 m/a）。这些发现强调，当地的地表特征，而不是气候变率，是该地区冰川质量损失的关键驱动因素。这项研究加强了对伊朗中部阿尔博尔斯山脉冰川变化的认识，强调了持续监测和区域评估的必要性，以便更好地掌握气候变化的影响。

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引用次数: 0

Neoarchean crustal evolution in the Madras Block: Geochemical and petrological evidence from felsic gneiss and amphibolite 马德拉斯地块新太古代地壳演化：来自长英质片麻岩和角闪岩的地球化学和岩石学证据

IF 2 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2025-12-01 DOI: 10.1016/j.polar.2025.101307

P.V. Thanooja , K. Sajeev , M. Satish-Kumar , I.S. Williams , T. Takahashi , C. Chatterjee

This study investigates the Neoarchean tectonic evolution of the Madras Block through various analyses of felsic orthogneiss and associated amphibolites. The felsic orthogneiss has high SiO₂ (∼67 wt%), LREE enrichment, high Ba (∼560 ppm) contents and high Sr/Y (∼96) ratios, with low MgO (∼1.60 wt%) and Y (∼7.1 ppm) contents, along with a highly fractionated REE profile (La/Yb_N ≈ 42), all suggesting an affinity with the Archean TTG suite. The amphibolites show geochemical diversity, with enclave samples displaying a MORB-like flat REE pattern, while larger outcrop-scale blocks exhibit LREE enrichment, resembling continental crust. Zircon U-Pb dating suggests that the felsic rocks of the Madras Block were emplaced over a short time span (2.57–2.51 Ga), and that this magmatic activity was closely followed by regional high-grade metamorphism. The Nd-Sr Isotopic ratios (¹⁴³Nd/¹⁴⁴Ndi: 0.509056–0.509359; ⁸⁷Sr/⁸⁶Sri: 0.7016–0.7033) and ɛNd(T) values (−4.3 to +0.4) indicate significant crust-mantle interactions. The felsic orthogneiss of the Madras Block was probably formed by a multi-stage petrogenetic process involving subduction-related partial melting of a MORB-like oceanic crust, followed by interaction with the mantle wedge and underplating of mafic magmas. Subsequent partial melting of the underplated basaltic crust and mixing with older continental components contributed to the generation of evolved felsic magmas. This model highlights the role of subduction, mantle–crust interaction, and deep crustal reworking in the formation of late Neoarchean continental crust.

本文通过对长英质正长岩及相关角闪岩的分析，探讨了马德拉斯地块的新太古代构造演化。长英质正长岩具有高SiO2 (~ 67 wt%)， LREE富集，高Ba （~ 560 ppm）含量和高Sr/Y（~ 96）比，低MgO （~ 1.60 wt%）和Y （~ 7.1 ppm）含量，以及高度分异的REE剖面（La/YbN≈42），都表明与太古宙TTG组有亲缘关系。角闪岩具有地球化学多样性，其中飞地样品显示出类似morb的扁平稀土模式，而较大的露头尺度块体则表现出类似大陆地壳的LREE富集。锆石U-Pb定年表明，马德拉斯地块长英质岩的侵位时间较短（2.57 ~ 2.51 Ga），岩浆活动紧随其后的是区域性高变质作用。Nd- sr同位素比值（143Nd/144Ndi: 0.509056 ~ 0.509359; 87Sr/86Sri: 0.7016 ~ 0.7033）和Nd(T)值（−4.3 ~ +0.4）表明壳幔相互作用显著。马德拉斯地块的长英质正长石可能是由一个多阶段的成岩过程形成的，其中包括与俯冲有关的morb类洋壳的部分熔融，随后与地幔楔和基性岩浆的底板相互作用。随后，下镀玄武岩地壳部分熔融，并与较老的大陆成分混合，形成了演化的长英质岩浆。该模型强调了俯冲作用、幔壳相互作用和深部地壳改造在新太古代晚期大陆地壳形成中的作用。

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引用次数: 0

The situation of Inuit communities in northwest Greenland (Kalaallit Nunaat) amid continuously changing environmental and social conditions 格陵兰西北部因纽特人社区（Kalaallit Nunaat）在不断变化的环境和社会条件中的处境

IF 2 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2025-12-01 DOI: 10.1016/j.polar.2025.101257

Monica Ogawa , Ryo Kusaka , Shin Sugiyama , Yoko Mitani

In several regions in the Arctic, scientific knowledge to assess and predict the impacts of environmental changes is insufficient, due to its remoteness and the challenging conditions for conducting surveys. Here, we listened to and documented the stories of the lives of Indigenous people living around Inglefield Bredning, northwest Greenland, to understand the environmental and ecological changes occurring in this area, and the impact of these changes on their lives. Our study introduces scientifically-undocumented environmental and ecological changes in this region such as an increase in Atlantic species, and suggests that these changes are interrelated and occur as part of a chain reaction, rather than in isolation. Through this study, we emphasize the necessity of a multifaceted approach for a better understanding of the complex intertwining of environmental, ecological, cultural, and social changes to develop effective and sustainable management.

在北极的一些地区，评估和预测环境变化影响的科学知识不足，因为它地处偏远，而且进行调查的条件具有挑战性。在这里，我们聆听并记录了居住在格陵兰岛西北部英格菲尔德布雷丁附近的土著居民的生活故事，以了解该地区发生的环境和生态变化，以及这些变化对他们生活的影响。我们的研究介绍了该地区没有科学记录的环境和生态变化，例如大西洋物种的增加，并表明这些变化是相互关联的，是连锁反应的一部分，而不是孤立的。通过这项研究，我们强调需要一个多方面的方法来更好地理解环境、生态、文化和社会变化的复杂交织，以制定有效和可持续的管理。

引用次数: 0

The seasonality of precipitation on the eastern Antarctic plateau (Dome-C) as derived from LIDAR and ICECAMERA 基于激光雷达和ICECAMERA的南极高原东部降水的季节性特征

IF 2 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2025-12-01 DOI: 10.1016/j.polar.2025.101265

Massimo Del Guasta

Antarctica's high latitudes are a challenging place to study precipitation. Despite this, direct monitoring of the habit and size of high-latitude precipitation is crucial for validating the algorithms used to derive precipitation information from radar, and for improving the climatological modeling of polar areas. Precipitation study is primarily done in coastal Antarctica (e.g. Grazioli et al.,2017), while the high plateau lacks long-term direct observation of precipitation. A first statistical analysis of precipitation at Concordia Station (−75°S, 123°E, Antarctica) was performed by Del Guasta et al. (2024) making possible the study, over the period 2014–2021, of the habit-resolved size of ice crystals for ten representative ice habits, the altitude and temperature of formation, and the composition in terms of ice habits for different precipitation sources. In the present work, based on the same data set, the seasonal variations of habit-resolved grain size and habit composition were investigated. The seasonality of diamond dust's contribution to total precipitation was examined. The knowledge of the altitude of precipitation formation allowed the calculation of HYSPLIT backtrajectories for each precipitation event. For the first time, measurements instead of modeling were used to obtain the pathways of precipitation reaching Concordia Station. The seasonal variations of these pathways were also examined.

南极洲的高纬度地区是研究降水的一个具有挑战性的地方。尽管如此，直接监测高纬度降水的习惯和大小对于验证用于从雷达获取降水信息的算法和改进极地地区的气候模拟至关重要。降水研究主要在南极沿海进行（如Grazioli等，2017），而高原缺乏对降水的长期直接观测。Del Guasta等人（2024）对Concordia站（−75°S, 123°E，南极洲）的降水进行了首次统计分析，使2014-2021年期间研究10种代表性冰习性的习惯分解冰晶大小、形成的高度和温度以及不同降水源冰习性的组成成为可能。在同一数据集上，研究了习惯分辨粒度和习惯组成的季节变化。考察了金刚石尘对总降水贡献的季节性。通过了解降水形成的高度，可以计算每次降水事件的HYSPLIT反轨迹。这是第一次用测量代替模拟来获得降水到达康科迪亚站的路径。这些途径的季节性变化也进行了研究。

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引用次数: 0

Arctic marine environments regulated by ocean transport and air‒sea‒land interaction: Findings from the ArCS II Ocean Research Program 海洋运输和海陆空相互作用调节的北极海洋环境：来自ArCS II海洋研究计划的发现

IF 2 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2025-09-01 DOI: 10.1016/j.polar.2025.101205

Eiji Watanabe , Hiromichi Ueno , Tsubasa Kodaira , Akihiko Murata , Shigeto Nishino , Takahito Ikenoue , Masanobu Yamamoto , Daiki Nomura , Hiroto Abe , Yusuke Kawaguchi , Daisuke Hirano , Yuanxin Zhang , Sayaka Yasunaka

The second phase of the Arctic Challenge for Sustainability (ArCS II) project funded by the Japanese government was launched in June 2020. The Ocean Research Program of this project was engaged in research on Arctic marine environments and production of corresponding public datasets. Sub-program 1 was established to explore ocean heat/freshwater transport and biogeochemical cycles in seasonal and multi-year sea ice zones. Sub-program 2 focused on assessment of the vulnerability and resilience of marine ecosystems in response to rapid sea ice retreat. Sub-program 3 examined air–sea interactions related to sea ice and waves. The expected outcomes included refinement of Earth System Models, advancement of ecosystem-based fishery management, and development of safer maritime navigation. This article compiles the major findings of sub-programs 1 and 3, together with brief summaries on the research cruises, sea ice field campaigns, and modeling experiments conducted through various international collaborations. The scientific achievements of the ArCS II research activities foster a deeper understanding of the effects of climate change and provide information for socioeconomic benefit.

由日本政府资助的北极可持续发展挑战（ArCS II）项目的第二阶段于2020年6月启动。该项目的海洋研究项目主要从事北极海洋环境的研究和相关公共数据集的制作。子项目1旨在探索季节性和多年海冰带的海洋热/淡水运输和生物地球化学循环。子项目2侧重于评估海洋生态系统对海冰快速消退的脆弱性和复原力。子方案3检查了与海冰和波浪有关的海气相互作用。预期结果包括改进地球系统模型，推进基于生态系统的渔业管理，以及发展更安全的海上航行。本文汇编了子项目1和子项目3的主要发现，以及通过各种国际合作进行的研究巡航、海冰实地考察和模拟实验的简要总结。ArCS II研究活动的科学成果促进了对气候变化影响的更深入了解，并为社会经济效益提供了信息。

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