Inversion of spectral absorption in the optically complex coastal waters of the Mid-Atlantic Bight

[1] Recent advances in hydrologic optics offer the potential for quantitative maps of inherent optical properties, which can be inverted into optically significant constituents. During summer experiments in the Mid-Atlantic Bight (MAB) a procedure to invert bulk absorption measurements from off-the-shelf technology was developed. The inversion provides optical concentration estimates of phytoplankton, colored dissolved organic matter (CDOM), and detritus. Inversion estimates were validated against chlorophyll fluorescence, filter pad absorption, and phytoplankton pigment measurements. The inversion could account for up to 90% of the observed variance in particulates, CDOM, and detritus. Robust estimates for phytoplankton community composition could be achieved but required constraints on the inversion that phytoplankton dominate the red light absorption. Estimates for the composition, as indicated by spectral slopes, for CDOM and detritus were not robust. During the summer months in nearshore waters of the MAB, total absorption was almost equally associated (±10%) with phytoplankton, detritus, and CDOM, and the regions of variability were associated with major frontal boundaries. The variance between particulates, CDOM, and detritus varied spatially and with year; which precluded robust correlations.

[1]  Oscar Schofield,et al.  Detection of harmful algal blooms using photopigments and absorption signatures: A case study of the Florida red tide dinoflagellate, Gymnodinium breve , 1997 .

[2]  Donald R. Johnson,et al.  Dynamics and optics of the Hudson River outflow plume , 2003 .

[3]  R. Chant,et al.  Episodic physical forcing and the structure of phytoplankton communities in the coastal waters of New Jersey , 2004 .

[4]  T. Dickey,et al.  Partitioning in situ total spectral absorption by use of moored spectral absorption-attenuation meters. , 1999, Applied optics.

[5]  Alice L. Alldredge,et al.  Characteristics, dynamics and significance of marine snow , 1988 .

[6]  K. Carder,et al.  Marine humic and fulvic acids: Their effects on remote sensing of ocean chlorophyll , 1989 .

[7]  Andrew H. Barnard,et al.  Spectral particulate attenuation and particle size distribution in the bottom boundary layer of a continental shelf , 2001 .

[8]  Mark A. Moline,et al.  Nearshore Physical Processes and Bio-Optical Properties in the New York Bight , 2002 .

[9]  Neil V. Blough,et al.  Optical absorption spectra of waters from the Orinoco River outflow : terrestrial input of colored organic matter to the Caribbean , 1993 .

[10]  John J. Cullen,et al.  The deep chlorophyll maximum comparing vertical profiles of chlorophyll a , 1982 .

[11]  L. Prieur,et al.  Absorption by dissolved organic matter of the sea (yellow substance) in the UV and visible domains1 , 1981 .

[12]  C. Mobley.  Light and Water: Radiative Transfer in Natural Waters , 1994 .

[13]  Geir Johnsen,et al.  Using absorbance and fluorescence spectra to discriminate microalgae , 2002 .

[14]  Sarah A. Green,et al.  Optical absorption and fluorescence properties of chromophoric dissolved organic matter in natural waters , 1994 .

[15]  R. Chant,et al.  Biogeochemical impact of summertime coastal upwelling on the New Jersey Shelf , 2004 .

[16]  D. Siegel,et al.  Seasonal dynamics of colored dissolved material in the Sargasso Sea , 1998 .

[17]  S. Wright,et al.  CHEMTAX - a program for estimating class abundances from chemical markers: application to HPLC measurements of phytoplankton , 1996 .

[18]  Mark A. Moline,et al.  Bioinformatic approaches for objective detection of water masses on continental shelves , 2004 .

[19]  Daniel L. Roelke,et al.  Use of Discriminant and Fourth-Derivative Analyses With High-resolution Absorption Spectra for Phytoplankton Research: Limitations at Varied Signal-to-Noise Ratio and Spectral Resolution , 1999 .

[20]  N. Guixa-Boixereu,et al.  Distribution of viruses and their potential effect on bacterioplankton in an oligotrophic marine system , 1999 .

[21]  T. Aarup,et al.  Optical measurements in the North Sea-Baltic Sea transition zone. II. Water mass classification along the Jutland west coast from salinity and spectral irradiance measurements , 1996 .

[22]  M. DeGrandpre,et al.  Seasonal variation of CDOM and DOC in the Middle Atlantic Bight: Terrestrial inputs and photooxidation , 1997 .

[23]  G. Johnsen,et al.  In vivo absorption characteristics in 10 classes of bloom-forming phytoplankton: taxonomic characteristics and responses to photoadaptation by means of discriminant and HPLC analysis , 1994 .

[24]  H. Caspers,et al.  Optical Absorption and Fluorescence Spectra of EuF3 , 1967 .

[25]  M. Clarke,et al.  A Review of the Systematics and Ecology of Oceanic Squids , 1966 .

[26]  Robert F. Chen,et al.  The fluorescence of dissolved organic matter in seawater , 1992 .

[27]  M. Perry,et al.  Modeling in situ phytoplankton absorption from total absorption spectra in productive inland marine waters , 1989 .

[28]  Motoaki Kishino,et al.  Estimation of the spectral absorption coefficients of phytoplankton in the sea , 1985 .

[29]  Qin Boqiang,et al.  Partitioning spectral absorption of particulate matter in Meiliang Bay of Lake Taihu , 2006 .

[30]  T. Aarup,et al.  Optical measurements in the North Sea-Baltic Sea transition zone. I. On the origin of the deep water in the Kattegat , 1996 .

[31]  C. Gallegos,et al.  Partitioning spectral absorption in case 2 waters: discrimination of dissolved and particulate components. , 2002, Applied optics.

[32]  Andrew H. Barnard,et al.  A model for estimating bulk refractive index from the optical backscattering ratio and the implications for understanding particle composition in case I and case II waters , 2001 .

[33]  O. Schofield,et al.  Fluorescence characteristics of organic matter released from coastal sediments during resuspension , 2002 .

[34]  M. Moline,et al.  OPTICAL MONITORING AND FORECASTING SYSTEMS FOR HARMFUL ALGAL BLOOMS: POSSIBILITY OR PIPE DREAM? , 1999 .

[35]  Barbara Demmig-Adams,et al.  Carotenoids and photoprotection in plants : a role for the xanthophyll zeaxanthin , 1990 .

[36]  A. Barnard,et al.  Global relationships of the inherent optical properties of the oceans , 1998 .

[37]  N. Adir,et al.  Dynamics of photosystem II: mechanism of photoinhibition and recovery processes , 1992 .

[38]  Collin S. Roesler.  Theoretical and experimental approaches to improve the accuracy of particulate absorption coefficients derived from the quantitative filter technique , 1998 .

[39]  M. Perry,et al.  In situ phytoplankton absorption, fluorescence emission, and particulate backscattering spectra determined from reflectance , 1995 .

[40]  Dale A. Kiefer,et al.  Chlorophyll a fluorescence in phytoplankton: relationship to photosynthesis and biomass , 1985 .

[41]  M. Tomczak.  Some historical, theoretical and applied aspects of quantitative water mass analysis , 1999 .

[42]  Mark A. Moline,et al.  Deriving in situ phytoplankton absorption for bio‐optical productivity models in turbid waters , 2004 .

[43]  D. Kiefer,et al.  Chlorophyll a fluorescence in marine centric diatoms: Responses of chloroplasts to light and nutrient stress , 1973 .

[44]  Michael S. Twardowski,et al.  Microscale Quantification of the Absorption by Dissolved and Particulate Material in Coastal Waters with an ac-9 , 1999 .

[45]  Scott Glenn,et al.  Adaptive Sampling for Ocean Forecasting , 1999 .

[46]  Mark A Moline,et al.  Continuous hyperspectral absorption measurements of colored dissolved organic material in aquatic systems. , 2003, Applied optics.

[47]  Alan Weidemann,et al.  A comparison of methods for the measurement of the absorption coefficient in natural waters , 1995 .

[48]  D. Siegel,et al.  Chapter 11 – Chromophoric DOM in the Open Ocean , 2002 .

[49]  D. Mackey,et al.  Algal class abundances in the western equatorial Pacific: Estimation from HPLC measurements of chloroplast pigments using CHEMTAX , 1998 .

[50]  S. Glenn,et al.  Long-term Real-time Coastal Ocean Observation Networks , 2000 .

[51]  Bruce E. Logan,et al.  The abundance and significance of a class of large, transparent organic particles in the ocean , 1993 .

[52]  H. Claustre,et al.  Variability in the chlorophyll‐specific absorption coefficients of natural phytoplankton: Analysis and parameterization , 1995 .

[53]  B. Kroon.  VARIABILITY OF PHOTOSYSTEM II QUANTUM YIELD AND RELATED PROCESSES IN CHLORELLA PYRENOIDOSA (CHLOROPHYTA) ACCLIMATED TO AN OSCILLATING LIGHT REGIME SIMULATING A MIXED PHOTIC ZONE 1 , 1994 .

[54]  M. Moline,et al.  Optical discrimination of a phytoplankton species in natural mixed populations , 2000 .

[55]  Bruce E. Logan,et al.  The role of particulate carbohydrate exudates in the flocculation of diatom blooms , 1994 .

[56]  Mark A. Moline,et al.  The Long-term Ecosystem Observatory: an integrated coastal observatory , 2002 .

[57]  Daniel J. Repeta,et al.  Improved HPLC method for the analysis of chlorophylls and carotenoids from marine phytoplankton , 1991 .