Tid ally in duced, sud den tem per a ture drops in Nan Wan, par tic u larly pro nounced dur ing the spring tide, of ten bear eco log i cal con se quences. We use an Ocean Nowcast/Fore cast Sys tem (ONFS) at the US Na val Re search Lab o ra tory (NRL) to ex am ine a widely pub li cized cold-wa ter in tru sion event in July 2008, and com pare it with what we per ceived as a nor mal in tru sion event in June 2007. For a nor mal cold-wa ter in tru sion, cold anom a lies even tu ally prop a gate away in forms sim i lar to in ter nal Kel vin waves. For early July of 2008, the NRL ONFS sug gested an anom a lous, subtidal and es sen tially east ward cur rent near Nan Wan. The subtidal cur rent, su per im posed on the ebb cur rent, blocks the prop a ga tion of cold anom a lies in the di rec tion of in ter nal Kel vin waves, in duc ing anom a lous and in ef fi cient cold-wa ter dis persal. The NRL ONFS also sug gested the anom a lous subtidal current as a post-typhoon response to the passage of Typhoon Fengshen.
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Ko et al. (2009) studied this question.