In the past decade there has been extensive research into tropical intraseasonal variability, one of the major components of the low frequency variability of the general atmospheric circulation. This paper briefly rev...In the past decade there has been extensive research into tropical intraseasonal variability, one of the major components of the low frequency variability of the general atmospheric circulation. This paper briefly reviews the state-of-the-art in this research area: the nature of the Madden-Julian Oscillation, its relation to monsoonal and extratropical circulations, and the current theoretical understandings.展开更多
Objective Forty cases of IAMI were examined with coronary angiography in order to study the relationship of the vessels with the ECG of IAMI. Methods For coronary angiography Judkin' s method was used; IAMI was di...Objective Forty cases of IAMI were examined with coronary angiography in order to study the relationship of the vessels with the ECG of IAMI. Methods For coronary angiography Judkin' s method was used; IAMI was diagnosed by the 1979 WHO's standard of ISHD and ECG was separately measured by two doctors. Results Most of IAMI with polybranch coronary or its collateral disease (32. 5% and 42. 5% ) and only 10 cases (25% ) with single branch coronary disease, whose ECGs were untypical. Conclusion IAMI with single-branch coronary disease might express as mild symptoms and have no typical ECG change. While typical ECG change emerges, the coronary artery always showed poly-branch disease or collateral branch obstruction and the disease would be advanced. It is important to pay more attention to the cases of IAMI without classic ECG change so as to give diagnosis and treatment them in time.展开更多
In terms of the expansion by extended empirical orthogonal function (EEOF) with data of ECMWF WMO and of outgoing longwave radiation(OLR) furnished by the NOAA polar-orbiting satellite,a study is made of November 1981...In terms of the expansion by extended empirical orthogonal function (EEOF) with data of ECMWF WMO and of outgoing longwave radiation(OLR) furnished by the NOAA polar-orbiting satellite,a study is made of November 1981 to March 1982 low-frequency (30--60 day)summer monsoon activity in the Indone- sian-North Australian zone (INAZ) together with its relation to atmospheric circulations in the Northern and Southern Hemispheres. Results show that at 850 hPa the southward blowing low-frequency NE(SW)wind from the eastern Asian coast changes, after crossing the euqator, to summer NW (SE) monsoon in the INAZ, which, when converging with (diverging from) the western-Australian enforced low-frequency SW (NE) wind, brings about strengthened (weakened) convection in the summer monsoon area and its eastward advance, with corresponding low- frequency variation shown in 850 hPa geopotential height. These outcomes are similar to those from the study of non-filtered actual observations, leading to the conclusion that the component of low-frequency variation illustrates major features characteristic of the variation in the tropical circulation.展开更多
文摘In the past decade there has been extensive research into tropical intraseasonal variability, one of the major components of the low frequency variability of the general atmospheric circulation. This paper briefly reviews the state-of-the-art in this research area: the nature of the Madden-Julian Oscillation, its relation to monsoonal and extratropical circulations, and the current theoretical understandings.
文摘Objective Forty cases of IAMI were examined with coronary angiography in order to study the relationship of the vessels with the ECG of IAMI. Methods For coronary angiography Judkin' s method was used; IAMI was diagnosed by the 1979 WHO's standard of ISHD and ECG was separately measured by two doctors. Results Most of IAMI with polybranch coronary or its collateral disease (32. 5% and 42. 5% ) and only 10 cases (25% ) with single branch coronary disease, whose ECGs were untypical. Conclusion IAMI with single-branch coronary disease might express as mild symptoms and have no typical ECG change. While typical ECG change emerges, the coronary artery always showed poly-branch disease or collateral branch obstruction and the disease would be advanced. It is important to pay more attention to the cases of IAMI without classic ECG change so as to give diagnosis and treatment them in time.
基金The study is jointly supported by National Natural Science Foundation of Chinathe State Meteorological Administration Monsoon Research Funds.
文摘In terms of the expansion by extended empirical orthogonal function (EEOF) with data of ECMWF WMO and of outgoing longwave radiation(OLR) furnished by the NOAA polar-orbiting satellite,a study is made of November 1981 to March 1982 low-frequency (30--60 day)summer monsoon activity in the Indone- sian-North Australian zone (INAZ) together with its relation to atmospheric circulations in the Northern and Southern Hemispheres. Results show that at 850 hPa the southward blowing low-frequency NE(SW)wind from the eastern Asian coast changes, after crossing the euqator, to summer NW (SE) monsoon in the INAZ, which, when converging with (diverging from) the western-Australian enforced low-frequency SW (NE) wind, brings about strengthened (weakened) convection in the summer monsoon area and its eastward advance, with corresponding low- frequency variation shown in 850 hPa geopotential height. These outcomes are similar to those from the study of non-filtered actual observations, leading to the conclusion that the component of low-frequency variation illustrates major features characteristic of the variation in the tropical circulation.
