The paper is to depict the major structures of the Northern Hemispheric summer sealevel pressure (SLP), 500 hPa height (H 500) and 500 hPa ridge-and-trough (RAT) field during1951-1980. The 1960s’ jump was found in th...The paper is to depict the major structures of the Northern Hemispheric summer sealevel pressure (SLP), 500 hPa height (H 500) and 500 hPa ridge-and-trough (RAT) field during1951-1980. The 1960s’ jump was found in the major signal of each field as well as inthe series of many circulation parameters. The major part of the H 500 change was the heightlowering over the most of the Hemisphere during the 1960s, corresponding well to the sur-face temperature change. The SLP and RAT changed in a way similar to that of the rainfallchange, with regard to the southwest-to-northeast zonal structure in the geographical distri-butions of the major signals of all the three fields. The relationship between the changes ofsome circulation parameters and the regional rainfall is discussed.展开更多
文摘The paper is to depict the major structures of the Northern Hemispheric summer sealevel pressure (SLP), 500 hPa height (H 500) and 500 hPa ridge-and-trough (RAT) field during1951-1980. The 1960s’ jump was found in the major signal of each field as well as inthe series of many circulation parameters. The major part of the H 500 change was the heightlowering over the most of the Hemisphere during the 1960s, corresponding well to the sur-face temperature change. The SLP and RAT changed in a way similar to that of the rainfallchange, with regard to the southwest-to-northeast zonal structure in the geographical distri-butions of the major signals of all the three fields. The relationship between the changes ofsome circulation parameters and the regional rainfall is discussed.
