Oceanic and atmospheric influences on the variability of phytoplankton bloom in the Southwestern Indian Ocean

Raj, Roshin P.; Peter, Benny N.; Pushpadas, Dhanya

doi:10.1016/j.jmarsys.2010.05.009

Cited by 31 publications

(40 citation statements)

References 35 publications

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“…Additionally, we observe that the plankton front propagates with a higher velocity than the pure transport velocity of the jet. However, the resulting persistent eastward transport caused by the jet yield support for the hypothesis of a nutrient source at the south tip of Madagascar as the origin of the plankton bloom [Uz, 2007;Lévy et al, 2007;Raj et al, 2010].…”

Section: Discussionmentioning

confidence: 74%

“…In order to obtain a maximum similarity in extent and form between the tracer pattern and the real widespread plankton bloom on 17 February 1999 (Figure 2c), the tracer has to be released on 4 November 1998, about two months before first traces of the bloom can be seen. This early release of the passive tracer may be justified with the seasonality of possible nutrient sources close to the release point, being river runoff at the beginning of the rain season or upwelling [Uz, 2007;Raj et al, 2010].…”

Section: Resultsmentioning

confidence: 99%

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The impact of advective transport by the South Indian Ocean Countercurrent on the Madagascar plankton bloom

Huhn

Kameke

Pérez‐Muñuzuri

et al. 2012

Geophysical Research Letters

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Based on ten years (1998–2007) of satellite ocean color data we analyze the spatiotemporal patterns in the seasonal Madagascar plankton bloom with respect to the advection of the recently discovered Southern Indian Ocean Countercurrent (SICC). In maps of Finite‐time Lyapunov Exponents (FTLE) and Finite‐Time Zonal Drift (FTZD) computed from altimetry derived velocities we observe a narrow zonal jet that starts at ∼25°S at the southern tip of Madagascar, an important upwelling region, and extends to the east further than the largest plankton blooms (∼2500 km). In bloom years, the jet coincides with large parts of the northern boundary of the plankton bloom, acting as a barrier to meridional transport. Our findings suggest that advection is an important and so far underestimated mechanism for the eastward propagation and the extent of the plankton bloom. This supports the hypothesis of a single nutrient source south of Madagascar.

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Section: Discussionmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 99%

The impact of advective transport by the South Indian Ocean Countercurrent on the Madagascar plankton bloom

Huhn

Kameke

Pérez‐Muñuzuri

et al. 2012

Geophysical Research Letters

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“…Thus, similar to other regions of the world oceans (e.g. Falkowski et al 1991;Raj, Peter, and Pushpadas 2010;Gaube et al 2013), mesoscale eddies are important to the biology and fisheries of the Lofoten Basin. The above-mentioned importance of mesoscale eddies in the Lofoten Basin underlines the importance of monitoring it.…”

Section: Introductionmentioning

confidence: 90%

Monitoring the mesoscale eddies of the Lofoten Basin: importance, progress, and challenges

Raj¹,

Halo

2016

International Journal of Remote Sensing

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The Lofoten Basin is a 'hot spot' of intense mesoscale eddy activity in the Nordic Seas. The mesoscale eddies of the Lofoten Basin can be coupled to the heat transport, local climate, and fisheries of the region. During the past two decades, the European satellite missions European Remote Sensing (ERS) satellite and Environmental Satellite (ENVISAT) have played a major part in delivering continuous altimeter measurements over the Lofoten Basin. In recent years, automated eddy detection and tracking methods have revolutionized the long-term monitoring of eddies in the Lofoten Basin from the gridded altimeter data.

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“…This feature is one of the largest phytoplankton blooms in the world ocean, and has received much attention in the recent years (e.g., Huhn, von Kameke, Pérez-Muñuzuri, Olascoaga, & Beron-Vera, 2012;Lévy et al, 2007;Longhurst, 2001;Raj, Peter, & Pushpadas, 2010;Srokosz, 2004;Srokosz & Quartly, 2013;Uz, 2007). Interannual variability of this phytoplankton bloom is linked to the upwelling along the south coast of Madagascar, precipitation along the east coast of Madagascar, light limitation and local mesoscale circulation features (Raj et al, 2010). The time series of SCIAMACHY FLH and MODIS nFLH follow for most parts the variability of MODIS chl-a concentration.…”

Section: Temporal Variations In Sciamachy Marine Chl-a Fluorescencementioning

confidence: 99%

Global retrieval of marine and terrestrial chlorophyll fluorescence at its red peak using hyperspectral top of atmosphere radiance measurements: Feasibility study and first results

Wolanin

Розанов

Dinter

et al. 2015

Remote Sensing of Environment

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Keywords:Sun-induced fluorescence Retrieval SCIAMACHY GOME-2 Fraunhofer-line approach Hyperspectral remote sensing Ocean-atmosphere coupled radiative transfer Chlorophyll fluorescence is directly linked to the physiology of phytoplankton or plants. Here, we present a new satellite remote sensing approach to retrieve chlorophyll fluorescence at its red peak (~685 nm) by using measurements from the hyperspectral instruments SCanning Imaging Absorption SpectroMeter for Atmospheric CHartographY (SCIAMACHY) and Global Ozone Monitoring Experiment-2 (GOME-2). This method, which is based on the Differential Optical Absorption Spectroscopy (DOAS) technique, was used to exploit narrow spectral structures resulting from the filling-in of the Fraunhofer Fe I line, which originates from fluorescence. The reference spectra for chlorophyll fluorescence were calculated by the coupled ocean-atmosphere radiative transfer model SCIATRAN. We compared our results on marine chlorophyll fluorescence observations with the MODIS Terra normalized Fluorescence Line Height (nFLH) product for the average of years 2003-2011 and year 2009. Our method also enables the retrieval of chlorophyll fluorescence above land vegetation scenes. The results for the fluorescence observed above terrestrial vegetation for July and December 2009 were compared to MODIS Enhanced Vegetation Index (EVI). The comparisons show good spatial agreement between different retrievals providing evidence for the good performance of our algorithm. The method presented is generic and can be applied to other hyperspectral instruments in the future. Having established the retrieval technique, extensive studies of chlorophyll fluorescence will improve global knowledge on physiology and photosynthetic efficiency, in both the marine and terrestrial realms, and its dependence on environmental factors.

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Oceanic and atmospheric influences on the variability of phytoplankton bloom in the Southwestern Indian Ocean

Cited by 31 publications

References 35 publications

The impact of advective transport by the South Indian Ocean Countercurrent on the Madagascar plankton bloom

The impact of advective transport by the South Indian Ocean Countercurrent on the Madagascar plankton bloom

Monitoring the mesoscale eddies of the Lofoten Basin: importance, progress, and challenges

Global retrieval of marine and terrestrial chlorophyll fluorescence at its red peak using hyperspectral top of atmosphere radiance measurements: Feasibility study and first results

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