Aluminum(Al)serves as a crucial tracer for water mass movement and lithogenic input in the ocean.This study presents dissolved Al(dAl)and total dissolvable Al(tdAl)concentrations in seawater samples,as well as dAl con...Aluminum(Al)serves as a crucial tracer for water mass movement and lithogenic input in the ocean.This study presents dissolved Al(dAl)and total dissolvable Al(tdAl)concentrations in seawater samples,as well as dAl concentration in rainwater samples,collected during two spring cruises in 2021 and 2022 in the tropical western Pacific Ocean(TWPO;3°S-21°N,135°E-163°E).The Al concentration in surface waters shows a spatial pattern of higher levels in the north and lower levels in the south,with elevated values observed near the coast.Based on calculation,atmospheric Al deposition(dry+wet)did not significantly contribute to surface dAl concentrations.The primary factor controlling the distribution of dAl in the surface layer was water mass mixing,as indicated by the relationship between dAl and salinity.Subsurface layer near the equator showed elevated dAl and tdAl,transported eastward by the Equatorial Undercurrent(EUC).Sedimentary Al flux from New Guinea Island was several orders of magnitude higher than atmospheric input to the TWPO.The residence time of dAl and tdAl in the EUC were 67-160 days and 71-164 days,respectively,matching the time of EUC flowing across the study region(56-140 days),indicating strong zonal transport.The relationship between salinity and d Al concentrations in the intermediate water suggested that Al distribution in the TWPO was mainly controlled by the mixing of North Pacific Intermediate Water,and modified Antarctic Intermediate Water,which loaded a high dAl concentration from the Solomon Sea and New Guinea Island.In the deep layer,both dAl and tdAl exhibited elevated concentrations,likely due to sediment resuspension and/or release from clay minerals.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.42176042)supported by the National Natural Science Foundation of China Shiptime Sharing Project(Grant No.42049909)+3 种基金the High-end Users Program of“Kexue”(Grant No.KEXUE2019GZ01)the Major Science and Technology Infrastructure Renovation Project of Chinese Academy of Sciences(Grant No.DSS-WXGZ-2021-0011)the National Key Research and Development Program of China(Grant No.2023YFF0805001)the Taishan Scholars Program of Shandong Province。
文摘Aluminum(Al)serves as a crucial tracer for water mass movement and lithogenic input in the ocean.This study presents dissolved Al(dAl)and total dissolvable Al(tdAl)concentrations in seawater samples,as well as dAl concentration in rainwater samples,collected during two spring cruises in 2021 and 2022 in the tropical western Pacific Ocean(TWPO;3°S-21°N,135°E-163°E).The Al concentration in surface waters shows a spatial pattern of higher levels in the north and lower levels in the south,with elevated values observed near the coast.Based on calculation,atmospheric Al deposition(dry+wet)did not significantly contribute to surface dAl concentrations.The primary factor controlling the distribution of dAl in the surface layer was water mass mixing,as indicated by the relationship between dAl and salinity.Subsurface layer near the equator showed elevated dAl and tdAl,transported eastward by the Equatorial Undercurrent(EUC).Sedimentary Al flux from New Guinea Island was several orders of magnitude higher than atmospheric input to the TWPO.The residence time of dAl and tdAl in the EUC were 67-160 days and 71-164 days,respectively,matching the time of EUC flowing across the study region(56-140 days),indicating strong zonal transport.The relationship between salinity and d Al concentrations in the intermediate water suggested that Al distribution in the TWPO was mainly controlled by the mixing of North Pacific Intermediate Water,and modified Antarctic Intermediate Water,which loaded a high dAl concentration from the Solomon Sea and New Guinea Island.In the deep layer,both dAl and tdAl exhibited elevated concentrations,likely due to sediment resuspension and/or release from clay minerals.
