FN Archimer Export Format
PT J
TI Using CDOM optical properties for estimating DOC concentrations and pCO(2) in the Lower Amazon River
BT 
AF VALERIO, Aline de Matos
   KAMPEL, Milton
   VANTREPOTTE, Vincent
   WARD, Nicholas D.
   SAWAKUCHI, Henrique Oliveira
   DA SILVA LESS, Diani Fernanda
   NEU, Vania
   CUNHA, Alan
   RICHEY, Jeffrey
AS 1:1;2:1;3:2;4:3;5:4,5;6:6,7;7:8;8:6;9:9;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;
C1 INPE, BR-12227010 Sao Jose Dos Campos, SP, Brazil.
   CNRS, USR3456, Cayenne 97334, French Guiana.
   Pacific Northwest Natl Lab, Marine Sci Lab, Sequim, WA USA.
   Univ Sao Paulo, CENA, Caixa Postal 96, BR-13416000 Piracicaba, SP, Brazil.
   Umea Univ, Dept Ecol & Environm Sci, SE-90187 Umea, Sweden.
   Univ Fed Amapa, UNIFAP, Caixa Postal 261, BR-68906970 Macapa, AP, Brazil.
   Univ Fed Oeste Para, UFOPA, BR-68040050 Santarem, PA, Brazil.
   Univ Fed Rural Amazonia, Caixa Postal 917, BR-66077530 Belem, Para, Brazil.
   UW, Seattle, WA 98195 USA.
C2 INPE, BRAZIL
   CNRS, FRANCE
   PACIFIC NORTHWEST NATL LAB, USA
   UNIV SAO PAULO, BRAZIL
   UNIV UMEA, SWEDEN
   UNIV FED AMAPA, BRAZIL
   UNIV FED OESTE PARA, BRAZIL
   UNIV FED RURAL AMAZONIA, BRAZIL
   UNIV WASHINGTON, USA
UM LEEISA
IF 3.561
TC 31
UR https://archimer.ifremer.fr/doc/00666/77821/80000.pdf
LA English
DT Article
AB Coloured dissolved organic matter (CDOM) is one of the major contributors to the absorption budget of most freshwaters and can be used as a proxy to assess non-optical carbon fractions such as dissolved organic carbon (DOC) and the partial pressure of carbon dioxide (pCO(2)). Nevertheless, riverine studies that explore the former relationships are still relatively scarce, especially within tropical regions. Here we document the spatial-seasonal variability of CDOM, DOC and pCO(2), and assess the potential of CDOM absorption coefficient (a(CDOM)(412)) for estimating DOC concentration and pCO(2) along the Lower Amazon River. Our results revealed differences in the dissolved organic matter (DOM) quality between clearwater (CW) tributaries and the Amazon River mainstream. A linear relationship between DOC and CDOM was observed when tributaries and mainstream are evaluated separately (Amazon River: N = 42, R-2 = 0.74, p<0.05; CW: N = 13, R-2 = 0.57, p<0.05). However, this linear relationship was not observed during periods of higher rainfall and river discharge, requiring a specific model for these time periods to be developed (N = 25, R-2 = 0.58, p<0.05). A strong linear positive relation was found between a(CDOM)(412) and pCO(2)(N = 69, R-2 = 0.65, p<0.05) along the lower river. pCO(2) was less affected by the optical difference between tributaries and mainstream waters or by the discharge conditions when compared to CDOM to DOC relationships. Including the river water temperature in the model improves our ability to estimate pCO(2) (N = 69; R-2 = 0.80, p<0.05). The ability to assess both DOC and pCO(2) from CDOM optical properties opens further perspectives on the use of ocean colour remote sensing data for monitoring carbon dynamics in large running water systems worldwide. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement 
PY 2018
PD JUN
SO Optics Express
SN 1094-4087
PU Optical Soc Amer
VL 26
IS 14
UT 000438209100006
DI 10.1364/OE.26.00A657
ID 77821
ER

EF