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| Titel |
Temperature trends at the Mauna Loa observatory, Hawaii |
| VerfasserIn |
B. D. Malamud, D. L. Turcotte, C. S. B. Grimmond |
| 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 ; 7, no. 3 ; Nr. 7, no. 3 (2011-08-31), S.975-983 |
| Datensatznummer |
250004622
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| Publikation (Nr.) |
 copernicus.org/cp-7-975-2011.pdf |
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| Zusammenfassung |
| Observations at the Mauna Loa Observatory, Hawaii, established the
systematic increase of anthropogenic CO2 in the atmosphere. For the
same reasons that this site provides excellent globally averaged CO2
data, it may provide temperature data with global significance. Here, we
examine hourly temperature records, averaged annually for 1977–2006, to
determine linear trends as a function of time of day. For night-time data
(22:00 to 06:00 LST (local standard time)) there is a near-uniform warming
of 0.040 °C yr−1. During the day, the linear trend shows a slight
cooling of −0.014 °C yr−1 at 12:00 LST (noon). Overall, at Mauna
Loa Observatory, there is a mean warming trend of 0.021 °C yr−1. The
dominance of night-time warming results in a relatively large annual
decrease in the diurnal temperature range (DTR) of −0.050 °C yr−1
over the period 1977–2006. These trends are consistent with the observed
increases in the concentrations of CO2 and its role as a greenhouse gas
(demonstrated here by first-order radiative forcing calculations), and
indicate the possible relevance of the Mauna Loa temperature measurements to
global warming. |
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