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Composition and spatiotemporal distribution of ichthyoplankton on the continental shelf of the southern East China Sea 东海南部大陆架浮游鱼类的组成及时空分布
IF 0.8 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2021-04-01 DOI: 10.3319/tao.2020.12.04.01
Yi‐Chen Wang, Ming-An Lee
This study investigated the effects of the Kuroshio Front (KF) on the continental shelf of the southern East China Sea on ichthyoplankton communities during the northeast monsoon period. According to field observations and satellite images of sea surface temperature, we documented that the KF occurred and moved nearshore be-tween December and January before shifting seaward in March. In total, 156 species were identified among the 9896 individual larval fish collected. Multivariate analysis revealed significant differences in fish abundance and composition over time. The abundance of oceanic species increased by approximately 10% from December to January and then decreased by approximately 50% in March. Oceanic species, such as myctophid and gonostomatid fish, were dominant (37.4 - 86.5%) in the oceanic waters on the offshore side of the KF. Some coastal and commercial species, such as anchovies, were dominant (26.9 - 99.1%) in the neritic waters on the nearshore side of the KF from December to March. These results may have been influenced by spawning seasons and adult habitats. The strong front influenced the distribution of larval fish more than the weaker upwelling during winter did. Specifically, oceanic fish were brought into nearshore waters by Kuroshio water intrusion in winter. Most larvae were still restricted to the nearshore and offshore side by the KF, meaning that the strong KF was still a barrier separating most fish larvae assemblages, especially for those of the neritic species. The mechanism underlying the cross-frontal transport of fish larvae is more likely to occur in oceanic species, because it may be related to diel vertical migration behavior.
研究了东北季风期东海南部大陆架黑潮锋对浮游植物群落的影响。根据现场观测和海面温度的卫星图像,我们记录了KF在12月至1月期间发生并向近海移动,然后在3月向海移动。在收集到的9896条幼鱼中,共鉴定出156种。多变量分析显示,随着时间的推移,鱼类的丰度和组成存在显著差异。从12月到1月,海洋物种的丰度增加了约10%,然后在3月减少了约50%。在KF近海的海水中,海洋物种占主导地位(37.4-86.5%),如拟卵鱼和性腺造口鱼。12月至3月,一些沿海和商业物种,如凤尾鱼,在KF近岸侧的浅海水域占主导地位(26.9%至99.1%)。这些结果可能受到产卵季节和成虫栖息地的影响。与冬季较弱的上升流相比,强烈的锋面对幼鱼分布的影响更大。具体来说,冬季黑潮海水入侵将海洋鱼类带入近岸水域。大多数幼体仍然被KF限制在近岸和近海,这意味着强烈的KF仍然是分隔大多数鱼类幼体组合的屏障,尤其是对于那些浅海物种。鱼类幼虫跨额迁移的机制更可能发生在海洋物种中,因为它可能与昼夜垂直迁移行为有关。
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引用次数: 1
Implication of land use change to biogeophysical and biogeochemical processes in Jambi, Indonesia: Analysed using CLM5 印度尼西亚占比土地利用变化对生物地球物理和生物地球化学过程的影响:基于CLM5的分析
IF 0.8 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2021-01-01 DOI: 10.3319/tao.2020.12.17.01
U. Ma’rufah, T. June, A. Faqih, A. Ali, C. Stiegler, A. Knohl
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引用次数: 1
Characteristics and prediction of extreme drought event using LSTM model in Wei River Basin 基于LSTM模型的渭河流域极端干旱事件特征及预测
IF 0.8 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2021-01-01 DOI: 10.3319/tao.2021.02.07.01
Dongfei Yan, R. Jiang, Jiancang Xie, Yong Zhao, Jiwei Zhu, Jichao Liang
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引用次数: 1
Coastal inundation modeling and mapping for North Jakarta coast during a supermoon period 超级月亮期间北雅加达海岸的海岸淹没模拟和制图
IF 0.8 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2021-01-01 DOI: 10.3319/tao.2021.04.02.01
N. Riama, R. F. Sari, W. Sulistya, H. Rahmayanti, Khafid Rizki Pratama, B. E. Pratama, Arief Wibowo Suryo
Coastal areas are very vulnerable to disasters. One of the disasters that needs serious attention in coastal areas, including the coast of Jakarta, is coastal inundation. However, there is no integrated coastal inundation prediction system implemented in this area. This study aimed to build a model of coastal inundation by combining various factors, namely hydrodynamic model, wave model, and river model. The model used in this research is the integration of the Delft3D model, the WaveWatch III-SWAN model, and the SOBEK model. The results show that the simulation of the water level was in accordance with the observed data, from 30 November to 8 December 2017 during the supermoon period with a correlation accuracy of 0.9 and RMSE of 5.9 cm. However, the results of the simulation and astronomical tide prediction have a correlation of 0.81 and an RMSE is 13.6 cm. Therefore, it can be seen that the model is better than the astronomical tide prediction. The hydrodynamic model shows that Jakarta Bay has a water level range of 0.66 to 0.68 m during the supermoon period. The mapping of flood inundation areas show that the water level in the Tanjung Priok and Marunda in North Jakarta has a maximum inundation level of 50 to 100 cm with an inundation area of 272.17312 and 456.03653 m 2 . Meanwhile, our analysis for the Ancol and Kalibaru shows an inundation level of 0 to 30 cm with an inundation area of 388.04358 and 169.17656 m 2 . Our model provides better accuracy because it takes into account several important variables for modeling coastal inundation. Our early warning system proved to be accurate in providing coastal inundation prediction information for the North Jakarta area.
沿海地区很容易受到灾害的影响。包括雅加达海岸在内的沿海地区需要严重关注的灾害之一是沿海洪水。然而,该地区尚未建立综合的沿海洪水预报系统。本研究旨在结合水动力模型、波浪模型和河流模型,建立沿海淹没模型。本研究使用的模型是Delft3D模型、WaveWatch III-SWAN模型和SOBEK模型的集成。结果表明,2017年11月30日~ 12月8日超级月亮期间的水位模拟与观测数据基本一致,相关精度为0.9,RMSE为5.9 cm。模拟结果与天文潮汐预报的相关系数为0.81,均方根误差为13.6 cm。由此可见,该模型比天文潮汐预测效果更好。水动力模型表明,超级月亮期间雅加达湾的水位在0.66 ~ 0.68 m之间。洪水淹没区地图显示,雅加达北部丹戎不ok和玛伦达的最大淹没水位为50 ~ 100 cm,淹没面积分别为272.17312和456.03653 m2。Ancol和Kalibaru的淹没水位为0 ~ 30 cm,淹没面积分别为388.04358和169.17656 m2。我们的模型提供了更好的准确性,因为它考虑了几个重要的变量来模拟沿海淹没。事实证明,我们的预警系统在为雅加达北部地区提供沿海洪水预报信息方面是准确的。
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引用次数: 1
A new record of Podocarpaceae fossil wood from Miocene strata, Northern Taiwan 台湾北部中新世石竹科木化石新记录
IF 0.8 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2021-01-01 DOI: 10.3319/tao.2021.07.28.02
Yuan-Po Lo, Jer‐Ming Hu
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引用次数: 1
Holocene fluvial landscape evolution driven by sea level and tectonic controls in the Gangkou River, Hengchun Peninsula 恒春半岛港口河全新世海平面和构造控制下的河流景观演化
IF 0.8 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2021-01-01 DOI: 10.3319/tao.2021.04.08.01
Jia-hong Chen, S. Chyi, J. Yen, Lih-Der Ho, C. Lüthgens, Pei-Ling Wang, Li‐Hung Lin, I. Yen, C. Jen, J. Huang
The fluvial landscape of the Hengchun Peninsula in southernmost Taiwan is generally characterized by a narrow river and a wide valley plain. Such underfit stream features are unusual in tectonically active areas such as Taiwan. In this research, we hypothesize that the relative sea level change since the end of the last glacial period might be the main factor driving the formation of this type of landscape on the relatively recently emerged Taiwan Island. The Gangkou River is among the largest and most pristine rivers on the Hengchun Peninsula, and well-preserved river terraces and bedrock exposures occur along the river and river mouth. Therefore, the Gangkou River was thoroughly surveyed to investigate the factors shaping the landscape and to determine the landscape evolutionary history. Our research indicates that the average uplift rate of the Gangkou River is 1.5 - 1.7 mm yr -1 . Because of the low uplift rate, the rising sea level after the last glaciation caused widespread aggra-dation in the Gangkou River. At approximately 8.0 - 7.7 ka, maximum flooding oc-curred, and the sea level subsequently remained stable, while the aggradation stopped after 7.1 ka. Incision followed, forming the high terraces, and starting in the Little Ice Age, repeated aggradation and incision occurred, forming the low terraces. These processes produced the current landscape of the Gangkou River. Overall, the uplift rates calculated from this research are relatively low in this tectonically active area.
恒春半岛位于台湾最南端,其河流景观以窄河宽谷平原为主要特征。这种欠拟合的河流特征在台湾这样的构造活跃地区是不寻常的。在本研究中,我们假设末次冰期结束以来的相对海平面变化可能是在相对较晚出现的台湾岛上形成这种景观的主要因素。港口河是恒春半岛上最大、最原始的河流之一,沿河和河口有保存完好的河流梯田和基岩暴露。因此,本文对港口河进行了深入的调查,探讨了景观形成的因素,并确定了景观演化史。研究表明,港口河的平均抬升速率为1.5 ~ 1.7 mm /年。末次冰期后的海平面上升,由于抬升速率低,造成了港口河的大面积淤积。大约在8.0 ~ 7.7 ka发生了最大洪水,随后海平面保持稳定,而在7.1 ka后停止了沉积。随后是切割,形成高阶地;从小冰期开始,反复发生沉积和切割,形成低阶地。这些过程形成了现在的港口河景观。总体而言,本研究计算的隆升速率在该构造活动区相对较低。
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引用次数: 0
Joint modulations of Taiwan rainfall by tropical cyclone, northeast monsoon, and intraseasonal oscillation in October 热带气旋、东北季候风及季内涛动对台湾十月雨量的联合调制
IF 0.8 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2021-01-01 DOI: 10.3319/tao.2021.09.06.01
T. Lai, Jau‐Ming Chen, C. Sui, M. Tsai, Ching-Feng Shih, Wei-Teh Li
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引用次数: 1
Determination of gravity anomalies in Java, Indonesia, from airborne gravity survey 印度尼西亚爪哇岛重力异常的航空重力测量测定
IF 0.8 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2021-01-01 DOI: 10.3319/tao.2021.06.04.01
B. Bramanto, K. Prijatna, A. Pahlevi, ‪Dina Anggreni Sarsito, D. Dahrin, E. Variandy, Raa Ina Sidrotul Munthaha‬‬‬‬‬‬‬‬
The Geospatial Information Agency of Indonesia (BIG) recently carried out an airborne gravity survey mission to support a reliable Indonesian geoid model. The gravity observations covered all the main islands of Indonesia. This paper presents a state-of-the-art for gravity anomalies derivation using airborne gravity mission in Java, Indonesia. The common gravity corrections for deriving the scalar free-air gravity anomalies along the flight trajectory had been estimated using GNSS-derived positions. The corrected data were then filtered using the FIR method in which the cut-off frequency had been predetermined by considering aircraft altitude, geological setting, and instrument’s accuracy. To assess the airborne gravity results, we compared them with the upward continued terrestrial gravity measurements. In addition, we performed crossover analysis and adjusted the estimated biases to the airborne gravity measurements. The accuracy of adjusted airborne gravity anomaly was estimated to 3.37 mGal. In conclusion, the airborne gravity mission provided valuable data needed for further geodesy and geophysics applications
印度尼西亚地理空间信息机构(BIG)最近开展了一项空中重力测量任务,以支持可靠的印度尼西亚大地水准面模型。重力观测覆盖了印度尼西亚所有主要岛屿。本文介绍了利用印度尼西亚爪哇的机载重力任务进行重力异常推导的最新技术。利用gnss导出的位置估计了沿飞行轨迹导出标量自由空气重力异常的常见重力修正。然后使用FIR方法对校正后的数据进行滤波,其中截止频率是通过考虑飞机高度、地质环境和仪器精度而预先确定的。为了评估空中重力的结果,我们将它们与向上持续的地面重力测量结果进行了比较。此外,我们进行了交叉分析,并将估计偏差调整到航空重力测量值。校正后的航空重力异常精度估计为3.37 mGal。总之,机载重力任务为进一步的大地测量和地球物理应用提供了宝贵的数据
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引用次数: 0
COSMIC-2 radio occultation temperature, specific humidity, and precipitable water in Hurricane Dorian (2019) COSMIC-2无线电掩星温度、比湿度和飓风多里安(2019)中的可降水量
IF 0.8 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2021-01-01 DOI: 10.3319/tao.2021.06.14.01
R. Anthes, J. Sjoberg, T. Rieckh, T. Wee, Z. Zeng
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引用次数: 2
Comprehensive validation of the FORMOSAT-7/COSMIC-2 electron density profiles and its application to space weather FORMOSAT-7/COSMIC-2电子密度曲线的综合验证及其在空间天气中的应用
IF 0.8 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2021-01-01 DOI: 10.3319/tao.2021.12.30.03
I. Lee, Jyun-Ying Huang, Hsu-hui Ho, Wen-How Yeh, Mark Chia-Ping Cheng
Comprehensive Validation of the FORMOSAT-7/COSMIC-2 Electron Density Profiles and Its Application to Space Weather I-Te Lee, Jyun-Ying Huang, Hsu-Hui Ho, Wen-How Yeh, Mark Chia-Ping Cheng 1. Advanced Research Center for Earth Sciences, National Central University, Taoyuan City, Taiwan 2. Central Weather Bureau, Taipei City, Taiwan 3. Department of Space Science and Engineering, National Central University, Taoyuan City, Taiwan 4. Center for Atmospheric Resource and Disaster Studies, National Taiwan University, Taipei City, Taiwan 5. National Space Organization, National Applied Research Laboratories, Hsinchu County, Taiwan
formsat -7/COSMIC-2卫星电子密度曲线的综合验证及其在空间天气中的应用李泰,黄俊英,何徐辉,叶文豪,程家平1。2.国立中央大学地球科学高级研究中心,台湾桃园市;台湾台北市中央气象局国立中央大学空间科学与工程系,台湾桃园市国立台湾大学大气资源与灾害研究中心,台北市国家太空组织,国家应用研究实验室,台湾新竹县
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引用次数: 0
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Terrestrial, Atmospheric and Oceanic Sciences
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