Climate Characteristics of Equator and North Pacific Sea Surface Temperature

Autor: Lee, Yu-Chi, 李昱祺
Rok vydání: 2017
Druh dokumentu: 學位論文 ; thesis
Popis: 105
Ocean is an important factor of adjusting the climate. On the other hand, under the circumstances of the global warming and the global change, sea surface temperature is a major indicator of weather variation and long-term climate change. In this thesis, Extended Reconstructed Sea Surface Temperature version 4 (ERSST), Advanced Very High Resolution Radiometer Sea Surface Temperature (AVHRR SST) and Ocean Heat Content (OHC) data supplied from National Oceanic and Atmospheric Administration are applied. ERSST represents the late century’s trend, AVHRR SST represents the late 30-year trend and OHC represents the late 60-year trend. In addition, Huang et al. (1998) developed the Empirical Mode Decomposition (EMD), which can be used in nonlinear and nonstationary data analysis. The ERSST result shows that no matter in all study regions, there have been the warmer circumstances since 1970. In the meanwhile, the warming in the Eastern Equatorial Pacific is earlier than it is in the Western Equatorial Pacific. However, as the long-term change showed, since 1941 the warming in all the global oceans has started decreasing instead. The warming rate of 1941 was 0.0087°"C/year" but in 2015, the rate decreased to -0.0061°"C/year". Furthermore, the North Pacific is 0.025°C/year in 1998 but is 0.011°"C/year" in 2105. Similarly, in the Equatorial Pacific, the warming rate of 1998 was 0.015°"C/year,but it also decreased to " 0.012°"C/year" in 2015. The result is concordant with some of the recent papers, which found that the warming reduced between 1998 and 2013 (Kosaka and Xie, 2013; Yan et al., 2016). In AVHRR data’s results, there are warmer situation in all regions between 1980 and 2010. However, there has been the cooler situation in all regions since 2010. The warming rates also have decreased in the late 20 years. Moreover, the OHC data showed that there have increased situations in all regions except the Western Equatorial Pacific. The change rate increases in the global oceans, the North Pacific and the Equatorial Pacific, and the Equatorial Pacific. In the Eastern Equatorial Pacific is around 0.1"×" 〖"10" 〗^"18" "J/year" through the period, but in the Western Equatorial Pacific, it decreases.
Databáze: Networked Digital Library of Theses & Dissertations
Externí odkaz: