气候变化领域集成服务门户(CCPortal): Assessment of Observational Evidence for Direct Convective Hydration of the Lower Stratosphere

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DOI	10.1029/2020JD032793
	Assessment of Observational Evidence for Direct Convective Hydration of the Lower Stratosphere
	Jensen E.J.; Pan L.L.; Honomichl S.; Diskin G.S.; Krämer M.; Spelten N.; Günther G.; Hurst D.F.; Fujiwara M.; Vömel H.; Selkirk H.B.; Suzuki J.; Schwartz M.J.; Smith J.B.
发表日期	2020
ISSN	2169897X
卷号	125 期号:15
英文摘要	In situ and remote sensing observations of water vapor are analyzed to assess the evidence for direct convective hydration of the lower stratosphere. We have examined several hundred balloon-borne and airborne in situ measurements of lower stratospheric humidity in the tropics and northern midlatitudes. We find that the tropical lower stratospheric H2O enhancements above the background occur quite infrequently, and the height of the enhancements is within about 1 km of the cold-point tropopause. Following Schwartz et al. (2013, https://doi.org/10.1002/grl.50421), we examine the anomalously high (above 8 ppmv) water vapor mixing ratios retrieved by the Aura Microwave Limb Sounder (MLS) at 100- and 82-hPa pressure levels, and we determine their vertical location relative to the local tropopause based on both Global Forecast System (GFS) operational analysis and the ERA5 reanalysis temperature data. We find that essentially all of the >8-ppmv MLS water vapor measurements over the extratropical North American monsoon region are above the relatively low lapse-rate tropopause in the region, and most are above the local cold-point tropopause. Over the Asian monsoon region, most (80/90%) of the high H2O values occur below the relatively high-altitude local lapse-rate/cold-point tropopause. Anomalously high MLS water vapor retrievals at 100 and 82 hPa almost never occur in the deep tropics. We show that this result is consistent with the in situ observations given the broad vertical averaging kernel of the MLS measurement. The available evidence suggests that direct hydration of the lower stratosphere is important over North America during the monsoon season but likely has limited impact in the tropics. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	convection; stratosphere; water vapor
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185858
作者单位	Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, United States; NASA Langley research Center, Hampton, VA, United States; Research Center Jülich, Institute for Energy and Climate Research-7, Jülich, Germany; Institute for Physics of the Atmosphere, Johannes Gutenberg University of Mainz, Mainz, Germany; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, United States; Global Monitoring Division, NOAA Earth System Research Laboratory, Boulder, CO, United States; Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan; Goddard Earth Sciences and Technology Center, University of Maryland, Baltimore County, Baltimore, MD, United States; Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Harvard John A. Paulson School of Engineering and Applied Sciences, Harv...
推荐引用方式 GB/T 7714	Jensen E.J.,Pan L.L.,Honomichl S.,et al. Assessment of Observational Evidence for Direct Convective Hydration of the Lower Stratosphere[J],2020,125(15).
APA	Jensen E.J..,Pan L.L..,Honomichl S..,Diskin G.S..,Krämer M..,...&Smith J.B..(2020).Assessment of Observational Evidence for Direct Convective Hydration of the Lower Stratosphere.Journal of Geophysical Research: Atmospheres,125(15).
MLA	Jensen E.J.,et al."Assessment of Observational Evidence for Direct Convective Hydration of the Lower Stratosphere".Journal of Geophysical Research: Atmospheres 125.15(2020).