tropical southern Pacific Authors: Jennifer C. Wei, V. R. Kotamarthi, D. J. Wuebbles Abstract. Significant seasonal variations in the concentrations of ozone, NOx, nonmethane hydrocarbons and other trace gases were observed in the southern tropical Pacific during the PEM-TROPICS-A (PT-A, Sep/Oct 1996) and PEM-TROPICS-B (PT-B, Mar/Apr 1999). Making these data sets more useful would require devel...

Air-sea exchange of elemental mercury (Hg(0)) is a critical component of the global biogeochemical Hg cycle. To better understand variability in atmospheric and oceanic Hg(0), we collected high-resolution measurements across large gradients in seawater temperature, salinity, and productivity in the Pacific Ocean (20°N-15°S). We modeled surface ocean Hg inputs and losses using an ocean general c...

Future changes in the position of intertropical convergence zone (ITCZ; a narrow band heavy precipitation tropics) with climate change could affect livelihood and food security billions people. Although models predict future narrowing ITCZ, uncertainties remain large regarding its position, most past work focusing on zonal-mean shifts. Here we use projections from 27 state-of-the-art document r...

Intertropical Convergence Zone (ITCZ) primarily governs the convective rainfall potential of summer monsoon in Asia. In present study, non-parametric trend test with outgoing longwave radiation (OLR) for period last 42 years (1980–2021) have been analyzed ITCZ zone, representative zones Hadley circulation and Walker exploring deep convection activity. Besides, various climatic variables like te...

A regional model is used to study the radiative effect of boundary layer clouds over the Southeast Pacific on large-scale atmosphere circulation during August–October in 1999. With the standard settings, the model simulates reasonably well the large-scale circulation over the eastern Pacific, precipitation in the intertropical convergence zone (ITCZ) north of the equator, and marine boundary la...

The concept of biogeochemical provinces in the ocean was implicit in Longhurst’s (1) classic monograph, Ecological Geography of the Sea. Longhurst identified distinct oceanic zones based on the relationships of oceanic biology (using chlorophyll, a proxy for phytoplankton biomass, and primary production) to physical forcing (e.g., surface currents, mixing depth, and upwelling). As we have advan...

Recent theoretical advances in the relationship between heat transport and the position of the Intertropical Convergence Zone (ITCZ) present an elegant framework through which to interpret past changes in tropical precipitation patterns. Using a very large ensemble of climate model simulations, we investigate whether it is possible to use this framework to interpret changes in the position of t...

Within the context of anthropogenic warming, rainfall oscillations may induce especially important societal impacts worldwide. In this article, we propose to study potential underlying mechanisms related precipitation changes on a planetary scale by taking advantage recent theory Rossby waves long periods winding around subtropical gyres, Gyral Waves (GRWs). The stable oxygen isotopic compositi...

Using a high-resolution ocean general circulation model forced by NCEP/NCAR reanalysis data, the interannual variability of the Guinea Dome is studied from a new viewpoint of its possible link with the Atlantic Meridional Mode (AMM), which is related to the meridional migration of the Intertropical Convergence Zone (ITCZ). The dome develops off Dakar seasonally from late spring to late fall owi...

The rainy season of north-Northeastern Brazil (NE), one of the tropical regions with the largest rainfall interannual variability, is associated with the Intertropical Convergence Zone (ITCZ) influence, which is located in the southermost position during this season (March-April-May). However, there is a large interannual variability in the ITCZ position, associated with atmospheric and oceanic...