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    Recent Changes in Surface Humidity: Development of the HadCRUH Dataset

    Source: Journal of Climate:;2008:;volume( 021 ):;issue: 020::page 5364
    Author:
    Willett, Katharine M.
    ,
    Jones, Philip D.
    ,
    Gillett, Nathan P.
    ,
    Thorne, Peter W.
    DOI: 10.1175/2008JCLI2274.1
    Publisher: American Meteorological Society
    Abstract: Water vapor constitutes the most significant greenhouse gas, is a key driver of many atmospheric processes, and hence, is fundamental to understanding the climate system. It is a major factor in human ?heat stress,? whereby increasing humidity reduces the ability to stay cool. Until now no truly global homogenized surface humidity dataset has existed with which to assess recent changes. The Met Office Hadley Centre and Climatic Research Unit Global Surface Humidity dataset (HadCRUH), described herein, provides a homogenized quality controlled near-global 5° by 5° gridded monthly mean anomaly dataset in surface specific and relative humidity from 1973 to 2003. It consists of land and marine data, and is geographically quasi-complete over the region 60°N?40°S. Between 1973 and 2003 surface specific humidity has increased significantly over the globe, tropics, and Northern Hemisphere. Global trends are 0.11 and 0.07 g kg?1 (10 yr)?1 for land and marine components, respectively. Trends are consistently larger in the tropics and in the Northern Hemisphere during summer, as expected: warmer regions exhibit larger increases in specific humidity for a given temperature change under conditions of constant relative humidity, based on the Clausius?Clapeyron equation. Relative humidity trends are not significant when averaged over the landmass of the globe, tropics, and Northern Hemisphere, although some seasonal changes are significant. A strong positive bias is apparent in marine humidity data prior to 1982, likely owing to a known change in reporting practice for dewpoint temperature at this time. Consequently, trends in both specific and relative humidity are likely underestimated over the oceans.
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      Recent Changes in Surface Humidity: Development of the HadCRUH Dataset

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4208517
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    contributor authorWillett, Katharine M.
    contributor authorJones, Philip D.
    contributor authorGillett, Nathan P.
    contributor authorThorne, Peter W.
    date accessioned2017-06-09T16:23:46Z
    date available2017-06-09T16:23:46Z
    date copyright2008/10/01
    date issued2008
    identifier issn0894-8755
    identifier otherams-67106.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4208517
    description abstractWater vapor constitutes the most significant greenhouse gas, is a key driver of many atmospheric processes, and hence, is fundamental to understanding the climate system. It is a major factor in human ?heat stress,? whereby increasing humidity reduces the ability to stay cool. Until now no truly global homogenized surface humidity dataset has existed with which to assess recent changes. The Met Office Hadley Centre and Climatic Research Unit Global Surface Humidity dataset (HadCRUH), described herein, provides a homogenized quality controlled near-global 5° by 5° gridded monthly mean anomaly dataset in surface specific and relative humidity from 1973 to 2003. It consists of land and marine data, and is geographically quasi-complete over the region 60°N?40°S. Between 1973 and 2003 surface specific humidity has increased significantly over the globe, tropics, and Northern Hemisphere. Global trends are 0.11 and 0.07 g kg?1 (10 yr)?1 for land and marine components, respectively. Trends are consistently larger in the tropics and in the Northern Hemisphere during summer, as expected: warmer regions exhibit larger increases in specific humidity for a given temperature change under conditions of constant relative humidity, based on the Clausius?Clapeyron equation. Relative humidity trends are not significant when averaged over the landmass of the globe, tropics, and Northern Hemisphere, although some seasonal changes are significant. A strong positive bias is apparent in marine humidity data prior to 1982, likely owing to a known change in reporting practice for dewpoint temperature at this time. Consequently, trends in both specific and relative humidity are likely underestimated over the oceans.
    publisherAmerican Meteorological Society
    titleRecent Changes in Surface Humidity: Development of the HadCRUH Dataset
    typeJournal Paper
    journal volume21
    journal issue20
    journal titleJournal of Climate
    identifier doi10.1175/2008JCLI2274.1
    journal fristpage5364
    journal lastpage5383
    treeJournal of Climate:;2008:;volume( 021 ):;issue: 020
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian