scholarly journals CHLOROPHYLL SPECIFIC ABSORPTION COEFFICIENTS AND THE IMPACT OF PHYTOPLANKTON TAXONOMIC GROUP OF SURFACE WATERS IN THE NORTHEASTERN GULF OF MEXICO

2009 ◽  
Vol 1 (1) ◽  
Author(s):  
Bisman Nababan
Keyword(s):  
Gulf Of Mexico ◽  
Absorption Coefficient ◽  
Chlorophyll A ◽  
Mississippi River ◽  
Specific Absorption Coefficient ◽  
Specific Absorption ◽  
Chlorophyll A Concentration ◽  
Average Value ◽  
Northeastern Gulf Of Mexico ◽  
The Impact

The chlorophyll-specific absorption coefficient at 440 nm (a*ph(440)) of surface water in the Northeastern Gulf of Mexico varied by a factor of 7 (0.02-0.15 m2 mg-1) with the of chlorophyll-a concentration of 0.06-12.25 mg m-3. In general, lower values of a*ph(440) (<0.06 m2 mg-1) were observed in the inshore particularly in the major river mouths. During summer, lower values of a*ph(440) were also observed offshore associated with low-salinity waters of the Mississippi River plume. Higher values of a*ph(440) (>0.1 m2 mg-1) were otherwise observed outside the river plumes in the outershelf and slope, where lower chlorophyll-a concentration occurred. Based on phytoplankton taxonomic groups, the average value of a*ph(440), of microphytoplankton group was significantly lower than that of nanophytoplankton and picophytoplantkon groups, suggesting that an increase in cell optical size (pigment packaging) resulted in decreasing a*ph(440) values. The relationship between a*ph(440) and chlorophyll-a concentration was also not linear, indicating pigment composition played an important role in determining a*ph(440) variability.Keywords: chlorophyll-specific absorption coefficient, microphytoplankton, nanophytoplankton,picophytoplankton, Gulf of Mexico, pigment, packaging effect

scholarly journals CHLOROPHYLL SPECIFIC ABSORPTION COEFFICIENTS AND THE IMPACT OF PHYTOPLANKTON TAXONOMIC GROUP OF SURFACE WATERS IN THE NORTHEASTERN GULF OF MEXICO

2009 ◽  
Vol 1 (1) ◽  
Author(s):  
Bisman Nababan
Keyword(s):  
Gulf Of Mexico ◽  
Absorption Coefficient ◽  
Chlorophyll A ◽  
Mississippi River ◽  
Specific Absorption Coefficient ◽  
Specific Absorption ◽  
Chlorophyll A Concentration ◽  
Average Value ◽  
Northeastern Gulf Of Mexico ◽  
The Impact

<p>The chlorophyll-specific absorption coefficient at 440 nm (a*<br />ph(440)) of surface water in the Northeastern Gulf of Mexico varied by a factor of 7 (0.02-0.15 m2 mg-1) with the of chlorophyll-a concentration of 0.06-12.25 mg m-3. In general, lower values of a*ph(440) (&lt;0.06 m2 mg-1) were observed in the inshore particularly in the major river mouths. During summer, lower values of a*ph(440) were also observed offshore associated with low-salinity waters of the Mississippi River plume. Higher values of a*ph(440) (&gt;0.1 m2 mg-1) were otherwise observed outside the river plumes in the outer<br />shelf and slope, where lower chlorophyll-a concentration occurred. Based on phytoplankton taxonomic groups, the average value of a*ph(440), of microphytoplankton group was significantly lower than that of nanophytoplankton and picophytoplantkon groups, suggesting that an increase in cell optical size (pigment packaging) resulted in decreasing a*<br />ph(440) values. The relationship between a*ph(440) and chlorophyll-a concentration was also not linear, indicating pigment composition played an important role in determining a*ph(440) variability.</p><p>Keywords: chlorophyll-specific absorption coefficient, microphytoplankton, nanophytoplankton,<br />picophytoplankton, Gulf of Mexico, pigment, packaging effect</p>

scholarly journals SEASONAL VARIABILITY OF LIGHT ABSORPTION COEFFICIENT OF SURFACE WATER

2016 ◽  
Vol 7 (2) ◽  
Author(s):  
Bisman Nababan ◽  
Denny A. Wiguna ◽  
Risti E. Arhatin
Keyword(s):  
Gulf Of Mexico ◽  
Absorption Coefficient ◽  
Loop Current ◽  
Surface Absorption ◽  
Average Value ◽  
Run Off ◽  
Significant Difference ◽  
Coefficient Measurement ◽  
Northeastern Gulf Of Mexico ◽  
Offshore Region

Absorption coefficient measurement can be used in estimating water quality, optical characteristic of water column, and marine bio-optical models. The purposes of this research were to determine values and variability of sea surface absorption coefficient in the northeastern Gulf of Mexico (NEGOM) based on various seasons. The data were collected in spring, summer, and fall seasons in 1999-2000 with AC-9 instrument. The spatial distribution of absorption coefficient showed that relatively high values were generally found along the run off Missisippi, Mobile, Chochawati, Escambia, Apalachicola, and Suwannee rivers, as well as Tampa Bay. Meanwhile, relatively low values were found in offshore region. This pattern followed the distribution pattern of chlorophyll and CDOM. Based on the local region comparison of spectral average value of absorption coefficient, we found a significant difference (α = 95%) among regions with the highest value in the run off of the Mississippi and Mobile rivers, and the lowest value in the offshore region. Comparison of spectral average value of absorption coefficient among seasons at the three primary wavelengths (blue=440 nm, green=510 nm, and red=676 nm) also showed a significant difference (α = 95%) with the highest value during the summer 1999 (Su-99) and the lowest value during the spring of 2000 (Sp-00). Absorption coefficient values were influenced by oceanographic factors that varied in every season such as wind, surface currents, upwelling, the location and speed of the Loop Current, and the river discharge of fresh water into the NEGOM.Keywords: absorption coefficient, seasons, chlorophyll, CDOM, northeastern Gulf of Mexico

scholarly journals SEASONAL VARIABILITY OF LIGHT ABSORPTION COEFFICIENT OF SURFACE WATER

2016 ◽  
Vol 7 (2) ◽  
Author(s):  
Bisman Nababan ◽  
Denny A. Wiguna ◽  
Risti E. Arhatin
Keyword(s):  
Gulf Of Mexico ◽  
Absorption Coefficient ◽  
Loop Current ◽  
Surface Absorption ◽  
Average Value ◽  
Light Absorption Coefficient ◽  
Run Off ◽  
Significant Difference ◽  
Northeastern Gulf Of Mexico ◽  
Offshore Region

<p><em>Absorption coefficient </em><em>measurement can </em><em>be </em><em>use</em><em>d</em><em> in</em><em> </em><em>estimat</em><em>ing</em><em> water quality, </em><em>op</em><em>t</em><em>ical </em><em>characteristic of water column, and </em><em>marine </em><em>bio-optical models. The purposes of this research were to determine values and variability of sea surface absorption coefficient in the northeastern Gulf of Mexico (NEGOM) based on various seasons. The data were collected </em><em>in</em><em> spring, summer, and fall seasons in 1999-2000 with AC-9 instrument. The spatial distribution of absorption coefficient showed that relatively high values </em><em>were </em><em>generally found along the run off Missisippi, Mobile, Chochawati, Escambia, Apalachicola, and Suwannee rivers, as well as Tampa Bay. Meanwhile, relatively low values were found in offshore region. </em><em>This pattern followed the</em><em> distribution pattern of chlorophyll and CDOM. Based on the local region comparison of spectral average value of absorption coefficient, we found a significant difference (α = 95%) among regions with the highest value in the run off of the Mississippi and Mobile rivers, and the lowest value in the offshore region. Comparison of spectral average value of absorption coefficient among seasons at the three primary wavelengths (blue=440 nm, green=510 nm, and red=676 nm) also showed a significant difference (α = 95%) with the highest value during the summer 1999 (Su-99) and the lowest value during the spring of 2000 (Sp-00). Absorption coefficient values were influenced by oceanographic factors that varied in every season such as wind, surface currents, upwelling, the location and speed of the Loop Current, and the river discharge of fresh water into the NEGOM.</em></p><strong><em>Keywords:</em></strong><em> absorption coefficient, seasons, chlorophyll, CDOM, northeastern Gulf of Mexico</em>

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