气候变化领域集成服务门户(CCPortal): Stickiness: A New Variable to Characterize the Temperature and Humidity Contributions toward Humid Heat

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DOI	10.1175/JAS-D-23-0072.1
	Stickiness: A New Variable to Characterize the Temperature and Humidity Contributions toward Humid Heat
	Ivanovich, Catherine c.; Sobel, Adam h.; Horton, Radley m.; Raymond, Colin
发表日期	2024
ISSN	0022-4928
EISSN	1520-0469
起始页码	81
结束页码	5
卷号	81 期号:5
英文摘要	Extreme wet -bulb temperatures (Tw) are often used as indicators of heat stress. However, humid heat extremes are fundamentally compound events, and a given Tw can be generated by various combinations of temperature and humidity. Differentiating between extreme humid heat driven by temperature versus humidity is essential to identifying these extremes' physical drivers and preparing for their distinct impacts. Here we explore the variety of combinations of temperature and humidity contributing to humid heat experienced across the globe. In addition to using traditional metrics, we derive a novel thermodynamic state variable named stickiness. Analogous to the oceanographic variable spice (which quantifies the relative contributions of temperature and salinity to a given water density), stickiness quantifies the relative contributions of temperature and specific humidity to a given Tw. Consistent across metrics, we find that high magnitudes of Tw tend to occur in the presence of anomalously high moisture, with temperature anomalies of secondary importance. This widespread humidity dependence is consistent with the nonlinear relationship between temperature and specific humidity as prescribed by the Clausius-Clapeyron relationship. Nonetheless, there is a range of stickiness observed at moderate -to -high Tw thresholds. Stickiness allows a more objective evaluation of spatial and temporal variability in the temperature versus humidity dependence of humid heat than traditional variables. In regions with high temporal variability in stickiness, predictive skill for humid heat -related impacts may improve by considering fluctuations in atmospheric humidity in addition to dry-bulb temperature.
英文关键词	Extreme events; Heat wave; Climate; Climate variability; Humidity
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:001222192000001
来源期刊	JOURNAL OF THE ATMOSPHERIC SCIENCES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/298846
作者单位	Columbia University; Columbia University; Columbia University; University of California System; University of California Los Angeles; National Aeronautics & Space Administration (NASA); NASA Jet Propulsion Laboratory (JPL); California Institute of Technology
推荐引用方式 GB/T 7714	Ivanovich, Catherine c.,Sobel, Adam h.,Horton, Radley m.,et al. Stickiness: A New Variable to Characterize the Temperature and Humidity Contributions toward Humid Heat[J],2024,81(5).
APA	Ivanovich, Catherine c.,Sobel, Adam h.,Horton, Radley m.,&Raymond, Colin.(2024).Stickiness: A New Variable to Characterize the Temperature and Humidity Contributions toward Humid Heat.JOURNAL OF THE ATMOSPHERIC SCIENCES,81(5).
MLA	Ivanovich, Catherine c.,et al."Stickiness: A New Variable to Characterize the Temperature and Humidity Contributions toward Humid Heat".JOURNAL OF THE ATMOSPHERIC SCIENCES 81.5(2024).