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18. Supplementary material to "Impact of Initialized Land Surface Temperature and Snowpack on Subseasonal to Seasonal Prediction Project, Phase I (LS4P-I): Organization and Experimental design"

Author

Xue, Yongkang, Yao, Tandong, Boone, Aaron A, Diallo, Ismaila, Liu, Ye, Zeng, Xubin, Lau, William K-M, Sugimoto, Shiori, Tang, Qi, Pan, Xiaoduo, van Oevelen, Peter J, Klocke, Daniel, Koo, Myung-Seo, Lin, Zhaohui, Takaya, Yuhei, Sato, Tomonori, Ardilouze, Constantin, Saha, Subodh K, Zhao, Mei, Liang, Xin-Zhong, Vitart, Frederic, Li, Xin, Zhao, Ping, Neelin, David, Guo, Weidong, Yu, Miao, Qian, Yun, Shen, Samuel SP, Zhang, Yang, Yang, Kun, Leung, Ruby, Yang, Jing, Qiu, Yuan, Brunke, Michael A, Chou, Sin Chan, Ek, Michael, Fan, Tianyi, Guan, Hong, Lin, Hai, Liang, Shunlin, Materia, Stefano, Nakamura, Tetsu, Qi, Xin, Senan, Retish, Shi, Chunxiang, Wang, Hailan, Wei, Helin, Xie, Shaocheng, Xu, Haoran, Zhang, Hongliang, Zhan, Yanling, Li, Weiping, Shi, Xueli, Nobre, Paulo, Qin, Yi, Dozier, Jeff, Ferguson, Craig R, Balsamo, Gianpaolo, Bao, Qing, Feng, Jinming, Hong, Jinkyu, Hong, Songyou, Huang, Huilin, Ji, Duoying, Ji, Zhenming, Kang, Shichang, Lin, Yanluan, Liu, Weiguang, Muncaster, Ryan, Pan, Yan, Peano, Daniele, de Rosnay, Patricia, Takahashi, Hiroshi G, Tang, Jianping, Wang, Guiling, Wang, Shuyu, Wang, Weicai, Zhou, Xu, and Zhu, Yuejian

Published
2021

25. Impact of Initialized Land Surface Temperature and Snowpack on Subseasonal to Seasonal Prediction Project, Phase I (LS4P-I): Organization and Experimental design

Author

Xue, Yongkang, Yao, Tandong, Boone, Aaron A, Diallo, Ismaila, Liu, Ye, Zeng, Xubin, Lau, William K-M, Sugimoto, Shiori, Tang, Qi, Pan, Xiaoduo, van Oevelen, Peter J, Klocke, Daniel, Koo, Myung-Seo, Lin, Zhaohui, Takaya, Yuhei, Sato, Tomonori, Ardilouze, Constantin, Saha, Subodh K, Zhao, Mei, Liang, Xin-Zhong, Vitart, Frederic, Li, Xin, Zhao, Ping, Neelin, David, Guo, Weidong, Yu, Miao, Qian, Yun, Shen, Samuel SP, Zhang, Yang, Yang, Kun, Leung, Ruby, Yang, Jing, Qiu, Yuan, Brunke, Michael A, Chou, Sin Chan, Ek, Michael, Fan, Tianyi, Guan, Hong, Lin, Hai, Liang, Shunlin, Materia, Stefano, Nakamura, Tetsu, Qi, Xin, Senan, Retish, Shi, Chunxiang, Wang, Hailan, Wei, Helin, Xie, Shaocheng, Xu, Haoran, Zhang, Hongliang, Zhan, Yanling, Li, Weiping, Shi, Xueli, Nobre, Paulo, Qin, Yi, Dozier, Jeff, Ferguson, Craig R, Balsamo, Gianpaolo, Bao, Qing, Feng, Jinming, Hong, Jinkyu, Hong, Songyou, Huang, Huilin, Ji, Duoying, Ji, Zhenming, Kang, Shichang, Lin, Yanluan, Liu, Weiguang, Muncaster, Ryan, Pan, Yan, Peano, Daniele, de Rosnay, Patricia, Takahashi, Hiroshi G, Tang, Jianping, Wang, Guiling, Wang, Shuyu, Wang, Weicai, Zhou, Xu, and Zhu, Yuejian

Abstract

Abstract. Sub-seasonal to seasonal (S2S) prediction, especially the prediction of extreme hydroclimate events such as droughts and floods, is not only scientifically challenging but has substantial societal impacts. Motivated by preliminary studies, the Global Energy and Water Exchanges (GEWEX)/Global Atmospheric System Study (GASS) has launched a new initiative called Impact of initialized Land Surface temperature and Snowpack on Sub-seasonal to Seasonal Prediction (LS4P), as the first international grass-root effort to introduce spring land surface temperature (LST)/subsurface temperature (SUBT) anomalies over high mountain areas as a crucial factor that can lead to significant improvement in precipitation prediction through the remote effects of land/atmosphere interactions. LS4P focuses on process understanding and predictability, hence it is different from, and complements, other international projects that focus on the operational S2S prediction. More than forty groups worldwide have participated in this effort, including 21 Earth System Models, 9 regional climate models, and 7 data groups. This paper overviews the history and objectives of LS4P, provides the first phase experimental protocol (LS4P-I) which focuses on the remote effect of the Tibetan Plateau, discusses the LST/SUBT initialization, and presents the preliminary results. Multi-model ensemble experiments and analyses of observational data have revealed that the hydroclimatic effect of the spring LST in the Tibetan Plateau is not limited to the Yangtze River basin but may have a significant large-scale impact on summer precipitation and its S2S prediction. LS4P models are unable to preserve the initialized LST anomalies in producing the observed anomalies largely for two main reasons: i) inadequacies in the land models arising from total soil depths which are too shallow and the use of simplified parameterizations which both tend to limit the soil memory; and ii) reanalysis data, that are used for initial conditions, have large discrepancies from the observed mean state and anomalies of LST over the Tibetan Plateau. Innovative approaches have been developed to largely overcome these problems.

Published
2021

45. Recent Third Pole’s rapid warming accompanies cryospheric melt and water cycle intensification and interactions between monsoon and environment: multi-disciplinary approach with observation, modeling and analysis Recent Third Pole’s rapid warming accompanies cryospheric melt and water cycle intensification and interactions between monsoon and environment: multi-disciplinary approach with observation, modeling and analysis

Author

Yao, Tandong, Xue, Yongkang, Chen, Deliang, Chen, Fahu, Thompson, Lonnie, Cui, Peng, Koike, Toshio, Lau, William K-M, Lettenmaier, Dennis, Mosbrugger, Volker, Zhang, Renhe, Xu, Baiqing, Dozier, Jeff, Gillespie, Thomas, Gu, Yu, Kang, Shichang, Piao, Shilong, Sugimoto, Shiori, Ueno, Kenichi, Wang, Lei, Wang, Weicai, Zhang, Fan, Sheng, Yongwei, Guo, Weidong, Ailikun, Yang, Xiaoxin, Ma, Yaoming, Shen, Samuel SP, Su, Zhongbo, Chen, Fei, Liang, Shunlin, Liu, Yimin, Singh, Vijay P, Yang, Kun, Yang, Daqing, Zhao, Xinquan, Qian, Yun, Zhang, Yu, and Li, Qian

Subjects
Astronomical and Space Sciences, Atmospheric Sciences, Physical Geography and Environmental Geoscience, Meteorology & Atmospheric Sciences
Abstract

Abstract: The Third Pole (TP) is experiencing rapid warming and is currently in its warmest period in the past 2,000 years. This paper reviews the latest development in multidisciplinary TP research associated with this warming. The rapid warming facilitates intense and broad glacier melt over most of the TP, although some glaciers in the northwest are advancing. By heating the atmosphere and reducing snow/ice albedo, aerosols also contribute to the glaciers melting. Glacier melt is accompanied by lake expansion and intensification of the water cycle over the TP. Precipitation has increased over the eastern and northwestern TP. Meanwhile, the TP is greening and most regions are experiencing advancing phenological trends, although over the southwest there is a spring phenological delay mainly in response to the recent decline in spring precipitation. Atmospheric and terrestrial thermal and dynamical processes over the TP affect the Asian monsoon at different scales. Recent evidence indicates substantial roles that mesoscale convective systems play in the TP’s precipitation as well as an association between soil moisture anomalies in the TP and the Indian monsoon. Moreover, an increase in geohazard events has been associated with recent environmental changes, some of which have had catastrophic consequences caused by glacial lake outbursts and landslides. Active debris flows are growing in both frequency of occurrences and spatial scale. Meanwhile, new types of disasters, such as the twin ice avalanches in Ali in 2016, are now appearing in the region. Adaptation and mitigation measures should be taken to help societies’ preparation for future environmental challenges. Some key issues for future TP studies are also discussed.

Published
2019

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