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Relative contribution of the anthropogenic forcing and natural variability to the interdecadal shift of climate during the late 1970s and 1990s
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  • 分类:P467[天文地球—大气科学及气象学] TP79[自动化与计算机技术—控制科学与工程;自动化与计算机技术—检测技术与自动化装置]
  • 作者机构:[1]Nansen-Zhu International Research Centre, Chinese Academy of Sciences, Beijing 100029, China, [2]Climate Change Research Centre, Chinese Academy ofSciences, Beijing 100029, China, [3]Nanjing University of Information Science and Technology,Nanjing 210044, China
  • 相关基金:supported by the National Natural Science Foundation of China(41205054;41205051);the Strategic Technological Program of the Chinese Academy of Sciences(XDA05090405);he Special Fund for the Public Welfare Industry(201006022)
中文摘要:

全球温暖在 1970 年代末以后加速了并且在 1990 年代末以后慢下来,伴随在地区性的气候的重要 interdecadal 变化。我们假设了 interdecadal 变化线性地由二个独立部件,人为的强迫和天赋组成了十的可变性,它能被二氧化碳\的放射的强迫效果简单地代表(( \text { RF }_{ \text {公司} _2 })\)并且和平的十的摆动( PDO )分别地。\的联合效果( \text { RF }_{ \text {公司} _2 }\)并且 PDO 能解释温度在1970年代末和1990年代期间改变的表面的多数,但是\的相对贡献的大小( \text { RF }_{ \text {公司} _2 }\)并且 PDO 在不同区域是不一致的。为表面温度和 geopotential 高度, \(\text { RF }_{\text { 公司 }_2 }\) 能导致显著地积极的异例在上几乎,为这二的全部地球变,在 midhigh 纬度并且在 1990 年代末移动展出更大的大小。PDO 能由于它的阶段转变(negative-positivenegative ) 为二 interdecadal 移动导致相反的异例。而且为在1970年代末的移动,两\( \text { RF }_{ \text {公司} _2 }\)( 53.7 ?% 66.7 ?%)并且 PDO ( 33.3 ?% 46.3 ?%)在调整热带 geopotential 高度是重要的,而\( \text { RF }_{ \text {公司} _2 }\)统治了变化在中间纬度。为西方的和平的副热带的高度, \(\text { RF }_{\text { 公司 }_2 }\)(PDO ) 能解释 52.3 ?% 62.1 ?%(37.9 ?% 47.7 ?%) 变化。PDO 的否定效果抵抗了大多数 \(\text { RF }_{\text { 公司 }_2 }\) 为 1990 年代末的效果变。

英文摘要:

Global warming accelerated after the late1970 s and slowed down after the late 1990 s, accompanying the significant interdecadal changes in the regional climate.We hypothesized that the interdecadal changes linearly consisted of two independent components, anthropogenic forcing and natural decadal variability, which can be represented simply by the radiative forcing effect of carbon dioxide (RFCO2) and the Pacific Decadal Oscillation(PDO), respectively. The combined effect of the RFCO2 and PDO could explain the majority of the surface temperature changes during the late 1970 s and 1990 s, but the magnitudes of the relative contribution of the RFCO2 and the PDO are inconsistent in different regions. For both the surface temperature and geopotential height, the RFCO2 could induce significantly positive anomalies over almost the entire globe for these two shifts, exhibiting a larger magnitude in the mid–high latitudes and in the late 1990 s shift.The PDO could induce opposite anomalies for the two interdecadal shifts due to its phase transitions(negativepositive–negative). Furthermore, for the shift in the late 1970s, both the RFCO2(53.7 %–66.7 %) and the PDO(33.3 %–46.3 %) were important in regulating the tropical geopotential height, whereas the RFCO2 dominated the changes in the mid-latitudes. For the western Pacific subtropical high, the RFCO2(PDO) could explain 52.3 %–62.1 %(37.9 %–47.7 %) of the change. The negative effect of the PDO counteracted most of the RFCO2 effects for the late 1990 s shift.

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