Monsoon oscillations regulate fertility of the Red Sea

Tropical ocean ecosystems are predicted to become warmer, more saline, and less fertile in a future Earth. The Red Sea, one of the warmest and most saline environments in the world, may afford insights into the function of the tropical ocean ecosystem in a changing planet. We show that the concentration of chlorophyll and the duration of the phytoplankton growing season in the Red Sea are controlled by the strength of the winter Arabian monsoon (through horizontal advection of fertile waters from the Indian Ocean). Furthermore, and contrary to expectation, in the last decade (1998–2010) the winter Red Sea phytoplankton biomass has increased by 75% during prolonged positive phases of the Multivariate El Nino–Southern Oscillation Index. A new mechanism is reported, revealing the synergy of monsoon and climate in regulating Red Sea greenness.

[1]  F. D’Ortenzio,et al.  Climate-Driven Basin-Scale Decadal Oscillations of Oceanic Phytoplankton , 2009, Science.

[2]  Ibrahim Hoteit,et al.  Abrupt warming of the Red Sea , 2011 .

[3]  Xiaoping Zhou,et al.  Marine ecology: Spring algal bloom and larval fish survival , 2003, Nature.

[4]  Francisco P. Chavez,et al.  From Anchovies to Sardines and Back: Multidecadal Change in the Pacific Ocean , 2003, Science.

[5]  Ibrahim Hoteit,et al.  Phytoplankton phenology indices in coral reef ecosystems: Application to ocean-color observations in the Red Sea , 2015 .

[6]  Corinne Le Quéré,et al.  Phytoplankton phenology in the global ocean , 2012 .

[7]  M. Lozier,et al.  Examining the global record of interannual variability in stratification and marine productivity in the low-latitude and mid-latitude ocean , 2013 .

[8]  John R. Lanzante,et al.  The Atmospheric Bridge: The Influence of ENSO Teleconnections on Air-Sea Interaction over the Global Oceans , 2002 .

[9]  K. Arrigo,et al.  The interplay between upwelling and deep convective mixing in determining the seasonal phytoplankton dynamics in the Gulf of Aqaba: Evidence from SeaWiFS and MODIS , 2003 .

[10]  S. Clemens,et al.  Forcing mechanisms of the Indian Ocean monsoon , 1991, Nature.

[11]  Ibrahim Hoteit,et al.  Exploring the Red Sea seasonal ecosystem functioning using a three‐dimensional biophysical model , 2014 .

[12]  W. Johns,et al.  Direct observations of seasonal exchange through the Bab el Mandab Strait , 1997 .

[13]  W. Patzert.  Wind-induced reversal in Red Sea circulation☆ , 1974 .

[14]  Amy S. Bower,et al.  The transport of nutrient-rich Indian Ocean water through the Red Sea and into coastal reef systems , 2014 .

[15]  P. C. Reid,et al.  Global synchrony of an accelerating rise in sea surface temperature , 2012, Journal of the Marine Biological Association of the United Kingdom.

[16]  J. Farrar,et al.  Zonal surface wind jets across the Red Sea due to mountain gap forcing along both sides of the Red Sea , 2009 .

[17]  D. Hydes,et al.  Seasonal and inter-annual biogeochemical variations in the Porcupine Abyssal Plain 2003–2005 associated with winter mixing and surface circulation , 2010 .

[18]  K. Wolter,et al.  El Niño/Southern Oscillation behaviour since 1871 as diagnosed in an extended multivariate ENSO index (MEI.ext) , 2011 .

[19]  J. Dunne,et al.  A comparison of methods to determine phytoplankton bloom initiation , 2013 .

[20]  Richard T. Barber,et al.  On the relationship between stratification and primary productivity in the North Atlantic , 2011 .

[21]  Francisco P Chavez,et al.  Marine primary production in relation to climate variability and change. , 2011, Annual review of marine science.

[22]  Anthony J. Richardson,et al.  Climate Impact on Plankton Ecosystems in the Northeast Atlantic , 2004, Science.

[23]  William E. Johns,et al.  An Oceanic General Circulation Model (OGCM) investigation of the Red Sea circulation: 2. Three‐dimensional circulation in the Red Sea , 2003 .

[24]  Ibrahim Hoteit,et al.  Remote Sensing the Phytoplankton Seasonal Succession of the Red Sea , 2013, PloS one.

[25]  T. Yamagata,et al.  The Red Sea outflow regulated by the Indian monsoon , 2006 .

[26]  W. Johns,et al.  Atmospherically Forced Exchange through the Bab el Mandeb Strait , 2012 .

[27]  Louis A. Codispoti,et al.  The 1994-1996 Arabian Sea Expedition : An integrated, interdisciplinary investigation of the response of the northwestern Indian Ocean to monsoonal forcing , 1998 .

[28]  O. Maury,et al.  Indian Ocean Dipole and El Niño/Southern Oscillation impacts on regional chlorophyll anomalies in the Indian Ocean , 2013 .

[29]  David A. Siegel,et al.  Climate-driven trends in contemporary ocean productivity , 2006, Nature.

[30]  A. Timmermann,et al.  Increasing frequency of extreme El Niño events due to greenhouse warming , 2014 .

[31]  C. McClain.  A decade of satellite ocean color observations. , 2009, Annual review of marine science.

[32]  Michele M. Rienecker,et al.  Mechanisms for the Indian Ocean warming during the 1997–98 El Niño , 1999 .

[33]  I. Hoteit,et al.  Comparison of chlorophyll in the Red Sea derived from MODIS-Aqua and in vivo fluorescence , 2013 .

[34]  Scott C. Doney,et al.  Oceanography: Plankton in a warmer world , 2006, Nature.

[35]  J. Fasullo,et al.  Warming of the Eurasian Landmass Is Making the Arabian Sea More Productive , 2005, Science.

[36]  B. Gentili,et al.  The dissolved yellow substance and the shades of blue in the Mediterranean Sea , 2009 .

[37]  Tong Zhu,et al.  Remotely-sensed chlorophyll a observations of the northern Red Sea indicate seasonal variability and influence of coastal reefs , 2008 .

[38]  I. Hoteit,et al.  Atmospheric forcing of the winter air–sea heat fluxes over the Northern Red Sea , 2013 .

[39]  Mark G. Meekan,et al.  Extreme climatic events reduce ocean productivity and larval supply in a tropical reef ecosystem , 2011 .

[40]  D. A. Siegel,et al.  The North Atlantic Spring Phytoplankton Bloom and Sverdrup's Critical Depth Hypothesis , 2002, Science.