Next Article in Journal
Improving Spatial-Temporal Data Fusion by Choosing Optimal Input Image Pairs
Next Article in Special Issue
Estimation of Size-Fractionated Primary Production from Satellite Ocean Colour in UK Shelf Seas
Previous Article in Journal
The Benefit of the Geospatial-Related Waveforms Analysis to Extract Weak Laser Pulses
Previous Article in Special Issue
Accuracy Assessment of Primary Production Models with and without Photoinhibition Using Ocean-Colour Climate Change Initiative Data in the North East Atlantic Ocean
Article Menu
Issue 7 (July) cover image

Export Article

Open AccessArticle
Remote Sens. 2018, 10(7), 1143; https://doi.org/10.3390/rs10071143

Variations in Remotely-Sensed Phytoplankton Size Structure of a Cyclonic Eddy in the Southwest Indian Ocean

1
Oceans & Coasts Research, Department of Environmental Affairs, Private Bag X4390, Cape Town 8000, South Africa
2
Marine Research Institute & Department of Oceanography, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
3
Bayworld Centre for Research & Education, 5 Riesling Road, Constantia, Cape Town 7806, South Africa
4
Plymouth Marine Laboratory (PML), Prospect Place, The Hoe, Plymouth PL1 3DH, UK
5
National Centre for Earth Observation, PML, Prospect Place, The Hoe, Plymouth PL1 3DH, UK
*
Author to whom correspondence should be addressed.
Received: 1 May 2018 / Revised: 1 June 2018 / Accepted: 2 June 2018 / Published: 19 July 2018
(This article belongs to the Special Issue Remote Sensing of Ocean Colour)
Full-Text   |   PDF [7129 KB, uploaded 18 October 2018]   |  

Abstract

Phytoplankton size classes were derived from weekly-averaged MODIS Aqua chlorophyll a data over the southwest Indian Ocean in order to assess changes in surface phytoplankton community structure within a cyclonic eddy as it propagated across the Mozambique Basin in 2013. Satellite altimetry was used to identify and track the southwesterly movement of the eddy from its origin off Madagascar in mid-June until mid-October, when it eventually merged with the Agulhas Current along the east coast of South Africa. Nano- and picophytoplankton comprised most of the community in the early phase of the eddy development in June, but nanophytoplankton then dominated in austral winter (July and August). Microphytoplankton was entrained into the eddy by horizontal advection from the southern Madagascar shelf, increasing the proportion of microphytoplankton to 23% when the chlorophyll a levels reached a peak of 0.36 mg·m−3 in the third week of July. Chlorophyll a levels declined to <0.2 mg·m−3 in austral spring (September and October) as the eddy propagated further to the southwest. Picophytoplankton dominated the community during the spring period, accounting for >50% of the population. As far as is known, this is the first study to investigate temporal changes in chlorophyll a and community structure in a cyclonic eddy propagating across an ocean basin in the southwest Indian Ocean. View Full-Text
Keywords: ocean colour; phytoplankton size structure; cyclonic eddy; Southwest Indian Ocean ocean colour; phytoplankton size structure; cyclonic eddy; Southwest Indian Ocean
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Lamont, T.; Barlow, R.G.; Brewin, R.J.W. Variations in Remotely-Sensed Phytoplankton Size Structure of a Cyclonic Eddy in the Southwest Indian Ocean. Remote Sens. 2018, 10, 1143.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Remote Sens. EISSN 2072-4292 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top