@article{fdi:010057125, title = {{M}odelling the impact of a {L}a {N}ina event on a {S}outh {W}est {P}acific {L}agoon}, author = {{F}uchs, {R}. and {D}upouy, {C}{\'e}cile and {D}ouillet, {P}ascal and {C}aillaud, {M}. and {M}angin, {A}. and {P}inazo, {C}.}, editor = {}, language = {{ENG}}, abstract = {{I}n view of increasing environmental awareness and biodiversity conservation, understanding the main forcing mechanism driving biogeochemical cycles in coral reefs and lagoon coastal areas is a priority. {L}a {N}ina events cause unbalanced situations in the {E}quatorial {P}acific and result in enhanced precipitation in {S}outh {W}est {P}acific coastal areas. {W}e investigated the impact of heavy rainfalls during the 2008 {L}a {N}ina event on the {N}ew {C}aledonia lagoon using a 3{D} coupled on-line hydrodynamic-biogeochemical model. {S}imulations and data showed that the whole lagoon was impacted by river inputs and stronger hydrodynamics, enhancing chlorophyll-a concentration by a factor between 1.7 and 1.9. {T}he coupled model provided new insights into plume transport, highlighting that eastern plumes can be advected northwards or can reach the {S}outh {W}est {L}agoon, depending on the balance between regional, tide-induced, and wind-induced surface currents. {I}t also provided a synoptic view of lagoon biogeochemical-hydrodynamic response, when remote sensing data are not available due to cloud coverage.}, keywords = {3{D} coupled model ; {B}iogeochemistry ; {H}ydrodynamics ; {C}oral reef lagoon ; {L}a {N}ina ; {F}reshwater inputs}, booktitle = {}, journal = {{M}arine {P}ollution {B}ulletin}, volume = {64}, numero = {8}, pages = {1596--1613}, ISSN = {0025-326{X}}, year = {2012}, DOI = {10.1016/j.marpolbul.2012.05.016}, URL = {https://www.documentation.ird.fr/hor/fdi:010057125}, }