Characterising mean and extreme diurnal variability of ocean CO2 system variables across marine environments

Diurnal variability of ocean CO2 system variables is poorly constrained. Here this variability and its drivers are assessed using 3‐hourly observations collected over 8‐140 months at 37 stations located in diverse marine environments. Extreme diurnal variability, i.e. when the daily amplitude exceeds the 99th percentile of diurnal variability, is comparable in magnitude to the seasonal amplitude and can surpass projected changes in mean states of pCO2 and [H+] over the twenty‐first century. At coastal sites and near coral reefs, extremes in diurnal amplitudes reach 187±85 and 149±106 μatm for pCO2, 0.21±0.08 and 0.11±0.07 for pH, and 1.2±0.5 and 0.8±0.4 for Ωarag, respectively. Extreme diurnal variability is weaker in the open ocean, but still reaches 47±18 μatm for pCO2, 0.04±0.01 for pH, and 0.25±0.11 for Ωarag. Diurnal variability of the ocean CO2 system is considerable and likely to respond to increasing CO2. Therefore, it should be represented in Earth system models.

Torres O., Kwiatkowski L., Sutton A. J., Dorey N., & Orr J. C., in press. Characterising mean and extreme diurnal variability of ocean CO2 system variables across marine environments. Geophysical Research Letters. Article (subscription required).

0 Responses to “Characterising mean and extreme diurnal variability of ocean CO2 system variables across marine environments”



  1. Leave a Comment

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.




Subscribe to the RSS feed

Powered by FeedBurner

Follow AnneMarin on Twitter

Blog Stats

  • 1,442,761 hits

OA-ICC HIGHLIGHTS

Ocean acidification in the IPCC AR5 WG II

OUP book

Archives