Changes of diurnal temperature range in taiwan and their large-scale associations: Univariate and multivariate trend analyses

Shu Ping Weng*

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

9 引文 斯高帕斯(Scopus)

摘要

By analyzing the long-term (1950-2007) variability of diurnal temperature range [DTR; daytime maximum (Tmax minus nighttime minimum (Tmin)] at 21 stations in Taiwan, this study applies univariate analysis, a trend-free prewhitening procedure combined with a modified Mann-Kendall test, and EOF-based multivariate trend analysis (TEOFA) to the ranked station DTR, Tmax, and Tmin. To reveal the large-scale associations with the local TEOFA results, this study also uses global gridded Tmax, Tmin, nighttime marine air temperature, and sea level pressure (SLP) datasets archived at the U.K. Meteorological Office Hadley Centre. On the basis of the signs and relative magnitudes between the annually-mean Tmax and Tmin trends, the stations can be classified into three types through univariate analysis. With a common increasing Tmin, type-A (type-B) stations have an increasing Tmin(Tmax faster than Tmax (Tmin whereas type-C stations have a decreasing Tmax. Both type-A and type-C (type-B) thus show(s) a decreasing (an increasing) DTR. For most stations, the increasing Tmin is the largest in December-February. In contrast, all type-B stations have an increasing Tmax peaking in June-August. Noticeably, six of nine type-B stations, either in the remote islands or in the seaports, are particularly influenced by the ocean. Three DTR trend modes stand out of TEOFA. The first mode, TEOF1, captures increasing DTR trends at four type-B stations and decreasing DTR trends elsewhere. The associated increasing Tmin(Tmax trend is consistent with the increasing (decreasing) clouds during nighttime (daytime) and is well-correlated with the largescale patterns, suggesting that it is part of the global warming scenario. Nevertheless, TEOF1 also captures a decreasing Tmax trend in Taiwan's highly developed western plains (i.e., type C) and eastern China where an increasing SLP pattern is observed, implying the anthropogenic forcings on DTR. TEOFM2 (TEOF3) depicts the decadal-to-interdecadal DTR variability in central (northern) Taiwan. Evolution of TEOF2 shows smaller (larger) amplitude before 1970s (after mid-1980s). The associated large-scale patterns suggest that TEOF2 (TEOF3) captures the relationship between an intensified (weakened) East Asian winter monsoon and La Nin ̃a (El Nin ̃o)-like condition in eastern (central) equatorial Pacific. Embedded in a Pacific-Japan-like teleconnection pattern, the southwestward intrusion of Pacific subtropical anticyclone in June-August that signifies the weakened southwesterly monsoon is also depicted by TEOF2.

原文英語
頁(從 - 到)203-226
頁數24
期刊Journal of the Meteorological Society of Japan
88
發行號2
DOIs
出版狀態已發佈 - 2010

ASJC Scopus subject areas

  • 大氣科學

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