Warm sea surface temperature (SST) anomalies have been observed in the subtropical North Pacific around Hawaii recent decade, appearing from 2013. We examined formation mechanisms of warm SST terms relative contribution atmospheric forcing and oceanic dynamics, using latest reanalysis products ECMWF (ERA5 for atmosphere ORAS5 ocean). Results mixed layer budget diagnosis target area (10–20°N 180...

a r t i c l e i n f o a b s t r a c t South Pacific subtropical density compensated temperature and salinity (spiciness) anomalies are known to be associated with decadal equatorial variability, however, the mechanisms by which such disturbances are generated, advect and the degree to which they modulate the equatorial thermocline remains controversial. During the late 1970's a climate regime t...

In the recent years, many international centers for numerical weather prediction and climate modeling have adopted in their operational codes a semiLagrangian scheme for transport. This numerical technique became very popular due to its stability and accuracy properties. The time step is only restricted by accuracy and not by a CFL stability condition. In a joint effort with CPTEC/INPE (the Bra...

An intense small-scale low pressure system that moved across portions of the midwest United States is examined. The system produced a continuous band of significant snowfall, typically only 50 km wide but extending over 1500 km in length. The system traveled across the Iowa Department of Transportation surface mesonetwork, allowing high-resolution surface analyses that show a closed circulation...

The stabilisation of the leapfrog time-stepping scheme provided by Robert–Asselin filter has enabled decades atmospheric and oceanic research weather climate predictions. unfortunate concomitant reduction from second-order accuracy to first-order inflicted recently ushered in a new generation time filters that preserve accuracy, including Robert–Asselin–Williams (RAW) its variants. These modern...

We present a new statistical method to optimally link local weather extremes to large-scale atmospheric circulation structures. The method is illustrated using July-August daily mean temperature at 2m height (T2m) time-series over the Netherlands and 500 hPa geopotential height (Z500) time-series over the Euroatlantic region of the ECMWF reanalysis dataset (ERA40). The method identifies pattern...

Abstract Ice streams are warmed by shear strain, both vertical near the bed and lateral at margins. Warm ice deforms more easily, establishing a positive feedback loop in an stream where fast flow leads to warm then even faster flow. Here, we use radar attenuation measurements show that Siple Coast colder than previously thought, which hypothesize is due along-flow advection of cold from upstre...