Frontal variability and its impact on chlorophyll in the Arabian Sea

摘要: Abstract Sixteen years of satellite observations are used to investigate frontogenesis, frontal variability and its impact on chlorophyll in the Arabian Sea. Large probability (FP) high mainly occur near coast, e.g., Somalia Oman, their values generally decrease with offshore distance. An empirical orthogonal function (EOF) is disentangle spatial temporal fronts chlorophyll. A prominent seasonal cycle activities identified for entire coastal region, peaking summer when southwesterly winds prevail. The seasonality same as that wind Somalia, which largely impacted by monsoons. During summer, southwest monsoon drives Ekman transport induces upwelling off Somalia. This process transports subsurface cold water nutrients surface layer, generates enhances Frontal can be an indicator determine level, at occurs FP exceeds 2%. dependence also found anomalous fields, strong induce more activities, further introduces frontogenesis extend 1000 km offshore, a simplified linear regression applied quantify relationship. leads chlorophyll, lags increasing distance, indicating horizontal advection water. In winter, northeast favorable downwelling; thus, greatly reduced. However, during this period mixing supplies resulting extends southwestward along coast. Thus, relationship between was less pronounced, especially Oman. regions, act intermediate connects forcing responses ecosystems. Sea fundamentally important improve our understanding monsoon-related ocean dynamics marine