Figure 4: Underway ΔfCO2 (shown in panels labeled with a) and CO2 flux anomalies (ΔFCO2; shown in panels labeled with b).
From: Collapse of the tropical and subtropical North Atlantic CO2 sink in boreal spring of 2010
ΔfCO2 refers to the difference between sea surface and atmospheric fCO2. ΔFCO2 was calculated as the difference between the underway CO2 flux and the normalized CO2 flux. The color code denotes the year of each cruise of the Monte Olivia/Rio Blanco (subscript “mon”) and Colibri (subscript “col”) vessels: 2007 (blue), 2009 (black), 2010 (red and orange) and 2011 (green). The contribution of SST and wind anomalies to ΔFCO2 flux during 2010 are also shown in panels labeled with c (and d when more than one voyage of each VOS was performed during that same month in 2010): red and orange dots represent the ΔFCO2 attributed to SST anomalies, while brown dots are the contribution of wind anomalies to the calculated ΔFCO2. The horizontal lines represent the limits of the surface currents identified in this study for reference.
