By making full use of GMS TBB data, diagnosis and analysis of the formation and development of El Ni駉 event in 2002 and 2003 were made. It suggests that the first clue of the El Ni event appeared in December 2001. Th...By making full use of GMS TBB data, diagnosis and analysis of the formation and development of El Ni駉 event in 2002 and 2003 were made. It suggests that the first clue of the El Ni event appeared in December 2001. The event was formed at the end of 2002 after five phases of development, and came into the phase of flourishing in the winter of 2002. From the analysis the dynamics, it is noted that that the position of the ascending branch of Walker cell was moving from the equatorial west Pacific to the equatorial central Pacific in the phase of formation and development of the El Ni駉 event. The process of diagnosis shows that it can provide an important clue for forecasting the genesis and development of the El Ni駉 episodes.展开更多
Interdecadal variability characteristics of ocean-atmosphere interaction in the tropical areas are investigated by using atmospheric reanalysis data and oceanic dataset. Results indicate that due to the ocean-atmosphe...Interdecadal variability characteristics of ocean-atmosphere interaction in the tropical areas are investigated by using atmospheric reanalysis data and oceanic dataset. Results indicate that due to the ocean-atmosphere system’s internal adjustment on interdecadal time scales, the exchanges of latent heat and sensible heat between the ocean and at- mosphere are reduced by means of weakening trade wind, causing oceanic thermocline anomalies and resulting in unusual warming of sea surface tem- perature in the central and eastern Pacific. Mean- while the increases of sea surface temperature fa- cilitate much more development of convection in the eastern Pacific and excite a local ascending motion in the eastern and anomalous westerlies in the central and eastern Pacific, which further weaken the Walker circulation, and vice versa. Thus these processes constitute an interdecadal mode of positive feedback. This interdecadal feedback of the tropical ocean- atmosphere system is different from the previous conclusion of a so-called midlatitude-driving mecha- nism, which was used to explain the decadal vari- ability in the tropical Pacific Ocean.展开更多
文摘By making full use of GMS TBB data, diagnosis and analysis of the formation and development of El Ni駉 event in 2002 and 2003 were made. It suggests that the first clue of the El Ni event appeared in December 2001. The event was formed at the end of 2002 after five phases of development, and came into the phase of flourishing in the winter of 2002. From the analysis the dynamics, it is noted that that the position of the ascending branch of Walker cell was moving from the equatorial west Pacific to the equatorial central Pacific in the phase of formation and development of the El Ni駉 event. The process of diagnosis shows that it can provide an important clue for forecasting the genesis and development of the El Ni駉 episodes.
基金supported by the National Natural Science Foundation of China(Grant Nos.40136010,90211010)the Chinese Academy of Sciences(YQ200501).
文摘Interdecadal variability characteristics of ocean-atmosphere interaction in the tropical areas are investigated by using atmospheric reanalysis data and oceanic dataset. Results indicate that due to the ocean-atmosphere system’s internal adjustment on interdecadal time scales, the exchanges of latent heat and sensible heat between the ocean and at- mosphere are reduced by means of weakening trade wind, causing oceanic thermocline anomalies and resulting in unusual warming of sea surface tem- perature in the central and eastern Pacific. Mean- while the increases of sea surface temperature fa- cilitate much more development of convection in the eastern Pacific and excite a local ascending motion in the eastern and anomalous westerlies in the central and eastern Pacific, which further weaken the Walker circulation, and vice versa. Thus these processes constitute an interdecadal mode of positive feedback. This interdecadal feedback of the tropical ocean- atmosphere system is different from the previous conclusion of a so-called midlatitude-driving mecha- nism, which was used to explain the decadal vari- ability in the tropical Pacific Ocean.
