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| Titel |
HadISDH: an updateable land surface specific humidity product for climate monitoring |
| VerfasserIn |
K. M. Willett, C. N. Williams, R. J. H. Dunn, P. W. Thorne, S. Bell, M. Podesta, P. D. Jones, D. E. Parker |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 9, no. 2 ; Nr. 9, no. 2 (2013-03-14), S.657-677 |
| Datensatznummer |
250018012
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| Publikation (Nr.) |
 copernicus.org/cp-9-657-2013.pdf |
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| Zusammenfassung |
HadISDH is a near-global land surface specific humidity monitoring product
providing monthly means from 1973 onwards over large-scale grids. Presented
herein to 2012, annual updates are anticipated. HadISDH is an update to the
land component of HadCRUH, utilising the global high-resolution land surface
station product HadISD as a basis. HadISD, in turn, uses an updated version
of NOAA's Integrated Surface Database. Intensive automated quality control
has been undertaken at the individual observation level, as part of HadISD
processing. The data have been subsequently run through the pairwise
homogenisation algorithm developed for NCDC's US Historical Climatology
Network monthly temperature product. For the first time, uncertainty
estimates are provided at the grid-box spatial scale and monthly timescale.
HadISDH is in good agreement with existing land surface humidity products in
periods of overlap, and with both land air and sea surface temperature
estimates. Widespread moistening is shown over the 1973–2012 period. The
largest moistening signals are over the tropics with drying over the
subtropics, supporting other evidence of an intensified hydrological cycle
over recent years. Moistening is detectable with high (95%) confidence
over large-scale averages for the globe, Northern Hemisphere and tropics,
with trends of 0.089 (0.080 to 0.098) g kg−1 per decade, 0.086 (0.075
to 0.097) g kg−1 per decade and 0.133 (0.119 to 0.148) g kg−1 per
decade, respectively. These changes are outside the uncertainty range for the
large-scale average which is dominated by the spatial coverage component;
station and grid-box sampling uncertainty is essentially negligible on
large scales. A very small moistening (0.013 (−0.005 to 0.031) g kg−1
per decade) is found in the Southern Hemisphere, but it is not significantly
different from zero and uncertainty is large. When globally averaged, 1998
is the moistest year since monitoring began in 1973, closely followed by
2010, two strong El Niño years. The period in between is relatively
flat, concurring with previous findings of decreasing relative humidity over
land. |
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