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| Titel |
Synoptic climatology and recent climate trends at Lake El'gygytgyn |
| VerfasserIn |
M. Nolan, E. N. Cassano, J. J. Cassano |
| 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. 3 ; Nr. 9, no. 3 (2013-06-19), S.1271-1286 |
| Datensatznummer |
250018066
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| Publikation (Nr.) |
 copernicus.org/cp-9-1271-2013.pdf |
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| Zusammenfassung |
| We developed a synoptic climatology for Lake El'gygytgyn, Chukotka Russia,
and explored modern climate trends affecting air temperatures there to aid
in paleoclimate reconstructions of a 3.6 million-year-old sediment core
taken from the lake. Our self-organized mapping (SOM) approach identified 35
synoptic weather patterns, based on sea level pressure, that span the range
of synoptic patterns influencing the study domain over the 1961–2009
NCEP/NCAR analysis period. We found strong seasonality in
modern weather patterns, with summer weather primarily characterized by weak
low pressure systems over the Arctic Ocean or Siberia and winter weather
primarily characterized by strong high pressure over the Arctic Ocean and
strong low pressure in the Pacific Ocean. In general, the primary source of
variation in air temperatures came from the dominant patterns in each
season, which we identify in the text, and nearly all of the dominant
weather patterns here have shown increasing temperatures. We found that
nearly all of the warming in mean annual temperature over the past 50 yr
(about 3 °C) occurred during sub-freezing conditions on either
side of summer (that is, spring and fall). Here we found that the most
summer-like weather patterns (low pressures to the north) in the shoulder
seasons were responsible for much of the change. Finally, we compared the
warmest 15 yr of the record (1995–2009) to the coolest (1961–1975) and
found that changes in thermodynamics of weather were about 3 to 300 times
more important than changes in frequency of weather patterns in controlling
temperature variations during spring and fall, respectively. That is, in the
modern record, general warming (local or advected) is more important by
orders of magnitude than changes in storm tracks in controlling air
temperature at Lake El'gygytgyn. We conclude with a discussion of how these
results may be relevant to the paleoclimate reconstruction efforts and how
this relevancy could be tested further. |
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