The analyses on the responses of partial pressure difference between sea and air (PCO2), and total dissolved CO2 concentration (TCO2), to abnormal air-sea event in different seasons, were based on observational data m...The analyses on the responses of partial pressure difference between sea and air (PCO2), and total dissolved CO2 concentration (TCO2), to abnormal air-sea event in different seasons, were based on observational data measured during cruises from Nov. 1986 to Dec 1997 in area of 22°N - 18°N, 114°E-130°E. The results indicated that in every season, TCO2 was high and PCO2 was positive during onset and mature period of El Nino, but they were low and negative respectively during La Nina. Before and after El Nino, partial pressure of CO2 in the sea and air were in the state of equilibrium. Both PCO2 (air) and PCO2 (air) had same responses to E1 Nino in each season. PCO2 (air) and PCO2 (sw) were high during mature period of El Nino were low before and in onset period of El Nino PCO2 and PCO2 (sw) reached peak value during E1 Nino and variation of PCO2 and PCO2 (sw) were same The mean exchange of CO2 from sea to air (flux) reached peak value during El Nino in autumn, and decreased during La Nina. Before and after El Nino the flux is weak, but in opposite direction from air to sea. According to the 1986-1993 average the characteristics of response of TCO2 anomaly to El Nino and La Nina and the range of outstanding variation in different season were discussed. From above it can be deduced some signals showing ENSO event as follows: in Oct.1995, El Nino of 91/95 was over: In May 1995 it is before a new El Nino: In July 1997 it is in onset of new El Nino; In Dec.1997 it is in the mature stage of E1 Nino event.展开更多
文摘The analyses on the responses of partial pressure difference between sea and air (PCO2), and total dissolved CO2 concentration (TCO2), to abnormal air-sea event in different seasons, were based on observational data measured during cruises from Nov. 1986 to Dec 1997 in area of 22°N - 18°N, 114°E-130°E. The results indicated that in every season, TCO2 was high and PCO2 was positive during onset and mature period of El Nino, but they were low and negative respectively during La Nina. Before and after El Nino, partial pressure of CO2 in the sea and air were in the state of equilibrium. Both PCO2 (air) and PCO2 (air) had same responses to E1 Nino in each season. PCO2 (air) and PCO2 (sw) were high during mature period of El Nino were low before and in onset period of El Nino PCO2 and PCO2 (sw) reached peak value during E1 Nino and variation of PCO2 and PCO2 (sw) were same The mean exchange of CO2 from sea to air (flux) reached peak value during El Nino in autumn, and decreased during La Nina. Before and after El Nino the flux is weak, but in opposite direction from air to sea. According to the 1986-1993 average the characteristics of response of TCO2 anomaly to El Nino and La Nina and the range of outstanding variation in different season were discussed. From above it can be deduced some signals showing ENSO event as follows: in Oct.1995, El Nino of 91/95 was over: In May 1995 it is before a new El Nino: In July 1997 it is in onset of new El Nino; In Dec.1997 it is in the mature stage of E1 Nino event.
