Analysis On The Relationships Of The South Asia High,the West Pacific Subtropical High And The Northeastern Pacific High In Summer

Based on EOF, composite analysis and correlation analyse,study is performed of relation of the south Asia high(SAH),the west Pacific Subtropical high (WPSH)and the northeastern Pacific high(NEPH) in Summer, followed by the elementary physical mechanism of the relations.The main conclusions are followed:There is a good positive correlativity in the intensity and time variations of the SAH and WPSH, the NEPH;there is a good positive correlativity in the location of axis of ridge of the SAH and WPSH,but is a good anticorrelation in the axis of ridge of the NEPH and WPSH .There is a correlation of "moveing face to face, moveing away from each other" of the SAH and the WPSH, the WPSH and the NEPH in Summer. The intensity of WPSH has changed mildly when the location of axis of ridge of the SAH is southward in June,July and August.And the intensity of WPSH has changed remarkably when the location of axis of ridge of the SAH is northward in summer. The intensity of WPSH has obvious change when the location of axis of ridge of the NEPH is southward in June,July and August; The intensity of the WPSH has lightly change when the location of axis of ridge of the NEPH is northward in summer.The paper discusses the physical mechanism of the relationships from the dynamical angle after analysising two examples in 1998 and 1964 .Our conclusion is:during the SAH eastward, the antivorticity advection is also eastward so that the convergence sinking motion is stronger, which led to the WPSH become stronger and more westward.During the WPSH eastward,the antivorticity advection is also eastward so that the convergence sinking motion is stronger, which led to the NEPH become stronger and more westward. The antivorticity advection moves toward the center of the SAH duing the SAH moving toward west, which led to the convergence sinking motion is stronger in the center of the SAH, so that the SAH is westward. The antivorticity advection moves toward the center of the WPSH duing the WPSH moving toward west, which led to the convergence sinking motion is stronger in the center of the WPSH, so that the west ridge dot of WPSH is eastward. The antivorticity advection in the west ridge dot of NEPH moves toward east, which led to the convergence sinking movement is stronger in the 135°W, so that the west ridge dot of NEPH is eastward.