The study of a forced delayed oscillator ENSO model suggests that the intensity of ENSO can be suppressed significantly by an external periodic forcing due to the nonlinear mechanism of frequency entrainment. This suppression of ENSO is most effective for ENSOs in the regime of unstable self-exciting oscillation and for forcing of frequencies close to that of ENSO. In particular, an annual cycl...

[1] Bottom water formed in the Weddell Sea plays a significant role in ventilating the global abyssal ocean, forming a central component of the global overturning circulation. To place Weddell Sea Bottom Water in the context of larger scale climate fluctuations, we analyze the temporal variability of an 8‐year (April 1999 through January 2007) time series of bottom water temperature relative to...

[1] The ensemble Kalman filter (EnKF) depends on a set of ensemble forecasts to calculate the background error covariances. Without model error perturbations and the inflation of forecast ensembles, the spread of the ensemble forecasts can collapse rapidly. There are several ways to generate model perturbations, i.e., perturbations in model parameters/parameterizations, perturbations in the for...

Dengue is an infectious mosquito-borne viral disease. Dengue or dengue-like epidemics ranks highly among new and newly emerging infectious diseases in public health significance and may affect persons of all ages in dengue endemic area. Dengue virus infections Montip Tiensuwan and Timothy O’Brien 2 may lead to dengue fever (DF), dengue haemorrhagic fever (DHF) and may lead to hypovolaemic shock...

We examine the impact of El Niño–Southern Oscillation (ENSO) on surface ozone abundance observed over the continental United States (U.S.) during 1993–2013. The monthly ozone decreases (increases) during El Niño (La Niña) years with amplitude up to 1.8 ppb per standard deviation of Niño 3.4 index. The largest ENSO influences occur over two southern U.S. regions during fall when the ENSO develop...

The impact of Indo-Pacific climate feedback on the dynamics of El Niño–Southern Oscillation (ENSO) is investigated using an ensemble set of Indian Ocean decoupling experiments (DCPL), utilizing a millennial integration of a coupled climatemodel. It is found that eliminating air–sea interactions over the IndianOcean results in various degrees of ENSO amplification across DCPL simulations, with a...

Abstract The reversal of surface air temperature anomalies (SATA) in winter brings a great challenge for short-term climate prediction, and the mechanisms are not well understood. This study found that SATA between December January over China could be demonstrated by second leading mode multivariate empirical orthogonal function analysis on December–January SATA. It further reveals central Paci...

Abstract A comprehensive investigation of the climatology and interannual variability trends in Asian summer monsoon anticyclone (ASMA) is presented, based on a novel area moments analysis. Moments include centroid location, aspect ratio, angle, “excess kurtosis” (measuring how far shape from elliptical) for an equivalent ellipse with same as ASMA. Key results are robust among three modern rean...