The asymmetric impact of abundant preceding rainfall on heat stress in low latitudes
Liu, Xingcai1,2; Tang, Qiuhong1,3; Liu, Wenfeng2,4; Yang, Hong2,5; Groisman, Pavel6,7,8; Leng, Guoyong9; Ciais, Philippe4; Zhang, Xuejun1; Sun, Siao1
Corresponding AuthorTang, Qiuhong(tangqh@igsnrr.ac.cn)
AbstractIn addition to high temperature, high humidity can have significant consequences on thermal comfort of human beings. The co-occurrence of high temperature and high humidity (so-called 'oppressive hot days') often results in heat stress events, but the extent to which it is affected by preceding surface moisture has not been fully understood to date. In this study, we examine the relations between preceding 3-month standardized precipitation index (SPI) and the number of hot days indicated by the surface air temperature (NHD-Tx) and the wet-bulb globe temperature (NHD-Wx) that combines both temperature and humidity in the hottest month in low latitudes. Results show that, in contrast with the negative correlations between SPI and NHD-Tx, which are associated with the previously reported precipitation deficit-temperature feedback, significant positive correlations between SPI and NHD-Wx are found in some low latitude areas. The probability of above-average NHD-Wx could be similar to 30% higher after wet conditions than that after dry conditions in areas like southern South America, some parts of Africa, and West Asia. Hotspot analyses further show that abundant preceding rainfall has an asymmetric impact on oppressive hot days by favoring more above-average NHD-Wx. Our analyses imply that a local feedback may exist between surface moisture and oppressive hot extremes, via which the unbearable heat stress over some parts of the tropics is modulated, controlled, and/or caused by changes in the preceding near-surface humidity/soil moisture. The spatially heterogeneous patterns of the relations between preceding rainfall and heat stress confirm the precipitation deficit-temperature feedback in many areas and reveal the coexistence of surface moisture-oppressive heat stress in several low latitude areas. We emphasize the necessity of considering both feedbacks for a better understanding of the distinct roles of preceding rainfall in the consequent development of heat stress in low latitudes.
Keywordheat extremes land-atmosphere coupling surface moisture humidity preceding rainfall
Indexed BySCI
Funding ProjectNational Natural Science Foundation of China[41730645] ; National Natural Science Foundation of China[41790424] ; National Natural Science Foundation of China[41425002] ; National Natural Science Foundation of China[41877164] ; Chinese Academy of Sciences[KGFZD-135-17-009-3] ; Early Postdoctoral Mobility Fellowship - Swiss National Science Foundation[P2EZP2_175096] ; Ministry of Education and Science of the Russian Federation[14.B25.31.0026]
Funding OrganizationNational Natural Science Foundation of China ; Chinese Academy of Sciences ; Early Postdoctoral Mobility Fellowship - Swiss National Science Foundation ; Ministry of Education and Science of the Russian Federation
WOS Research AreaEnvironmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS SubjectEnvironmental Sciences ; Meteorology & Atmospheric Sciences
WOS IDWOS:000462895800006
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Document Type期刊论文
Corresponding AuthorTang, Qiuhong
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China
2.Eawag, Swiss Fed Inst Aquat Sci & Technol, Ueberlandstr 133, CH-8600 Dubendorf, Switzerland
3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China
4.Univ Paris Saclay, CEA CNRS UVSQ, LSCE, IPSL, F-91191 Gif Sur Yvette, France
5.Univ Basel, MGU, Dept Environm Sci, Peterspl 1, CH-4003 Basel, Switzerland
6.North Carolina State Univ, NOAA, Natl Ctr Environm Informat, 151 Patton Ave, Asheville, NC 28801 USA
7.Russian Acad Sci, PP Shirshov Inst Oceanol, Moscow, Russia
8.Hydrol Sci & Serv Corp, 920 Rockhold Dr, Asheville, NC 28804 USA
9.Univ Oxford, Environm Change Inst, Oxford OX1 3QY, England
Recommended Citation
GB/T 7714
Liu, Xingcai,Tang, Qiuhong,Liu, Wenfeng,et al. The asymmetric impact of abundant preceding rainfall on heat stress in low latitudes[J]. ENVIRONMENTAL RESEARCH LETTERS,2019,14(4):9.
APA Liu, Xingcai.,Tang, Qiuhong.,Liu, Wenfeng.,Yang, Hong.,Groisman, Pavel.,...&Sun, Siao.(2019).The asymmetric impact of abundant preceding rainfall on heat stress in low latitudes.ENVIRONMENTAL RESEARCH LETTERS,14(4),9.
MLA Liu, Xingcai,et al."The asymmetric impact of abundant preceding rainfall on heat stress in low latitudes".ENVIRONMENTAL RESEARCH LETTERS 14.4(2019):9.
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