2018 CSDMS meeting-083: Difference between revisions
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|CSDMS meeting first name=Kang | |CSDMS meeting first name=Kang | ||
|CSDMS meeting last name=Wang | |CSDMS meeting last name=Wang | ||
|CSDMS meeting institute= | |CSDMS meeting institute=University of Colorado Boulder | ||
|CSDMS meeting city= | |CSDMS meeting city=Boulder | ||
|CSDMS meeting country= | |CSDMS meeting country=United States | ||
|CSDMS meeting state= | |CSDMS meeting state=Colorado | ||
|CSDMS meeting email address=Kang.Wang@Colorado.EDU | |CSDMS meeting email address=Kang.Wang@Colorado.EDU | ||
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{{CSDMS meeting select clinics1 2018 | {{CSDMS meeting select clinics1 2018 | ||
|CSDMS_meeting_select_clinics1_2018= | |CSDMS_meeting_select_clinics1_2018=1) Google Earth Engine | ||
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{{CSDMS meeting select clinics2 2018 | {{CSDMS meeting select clinics2 2018 | ||
|CSDMS_meeting_select_clinics2_2018= | |CSDMS_meeting_select_clinics2_2018=4) Permafrost Toolbox | ||
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{{CSDMS meeting select clinics3 2018 | {{CSDMS meeting select clinics3 2018 | ||
|CSDMS_meeting_select_clinics3_2018= | |CSDMS_meeting_select_clinics3_2018=4) Artificial Intelligence & Machine Learning | ||
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{{CSDMS meeting abstract yes no 2018 | {{CSDMS meeting abstract yes no 2018 | ||
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{{CSDMS meeting abstract title temp2018 | |||
|CSDMS meeting abstract title=Effect of Enhanced Cold-Season Climate Warming on Permafrost Temperatures | |||
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{{CSDMS meeting abstract template 2018 | |||
|CSDMS meeting abstract=It has been well documented that climate warming was greater in the Arctic than elsewhere. | |||
However, it is still poorly understood how climate changed over different permafrost | |||
zones and its potential impacts on permafrost thermal dynamics. In this study, | |||
we investigated changes in air temperatures, especially seasonal air temperatures, over different | |||
permafrost regions in the Northern Hemisphere using the Climate Research Unit | |||
(CRU) gridded datasets from 1976-2016. The primary results indicated that permafrost | |||
regions as a whole experienced a warming at 0.36, 0.41, and 0.46 °C/decade in mean annual | |||
maximum, mean, and minimum air temperature, respectively, which are 16%, 32%, | |||
and 44% higher than the corresponding trend in non-permafrost regions. More importantly, | |||
strong increases occurred in cold months and nighttime over continuous permafrost | |||
zone, exceeding 0.72 °C/decade in Spring and Autumn; while summer air temperature had | |||
a relatively small increase or no statistically significant trends. As a result, the decrease | |||
of air freezing index by 529 °C-day would result in permafrost temperature increase by | |||
1.43 °C in continuous permafrost zone over the past four decades. This may explain the | |||
observed evidence that increase of cold permafrost temperature was greater than that of | |||
warm permafrost, while active layer thickness had little or no change during the past several | |||
decades. These results suggest that predicted reduction of permafrost area by previous | |||
studies might be overestimated. | |||
}} | }} | ||
{{blank line template}} | {{blank line template}} | ||
Revision as of 13:38, 9 March 2018
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Browse abstracts
Effect of Enhanced Cold-Season Climate Warming on Permafrost Temperatures
It has been well documented that climate warming was greater in the Arctic than elsewhere.
However, it is still poorly understood how climate changed over different permafrost
zones and its potential impacts on permafrost thermal dynamics. In this study,
we investigated changes in air temperatures, especially seasonal air temperatures, over different
permafrost regions in the Northern Hemisphere using the Climate Research Unit
(CRU) gridded datasets from 1976-2016. The primary results indicated that permafrost
regions as a whole experienced a warming at 0.36, 0.41, and 0.46 °C/decade in mean annual
maximum, mean, and minimum air temperature, respectively, which are 16%, 32%,
and 44% higher than the corresponding trend in non-permafrost regions. More importantly,
strong increases occurred in cold months and nighttime over continuous permafrost
zone, exceeding 0.72 °C/decade in Spring and Autumn; while summer air temperature had
a relatively small increase or no statistically significant trends. As a result, the decrease
of air freezing index by 529 °C-day would result in permafrost temperature increase by
1.43 °C in continuous permafrost zone over the past four decades. This may explain the
observed evidence that increase of cold permafrost temperature was greater than that of
warm permafrost, while active layer thickness had little or no change during the past several
decades. These results suggest that predicted reduction of permafrost area by previous
studies might be overestimated.
