1 / 14

Organo-halogens and air sea transfer during MAP

Organo-halogens and air sea transfer during MAP. Simultaneous GC-MS measurements of iodocarbons & bromocarbons in air & surface seawater => 2 papers (combined with data from the RHaMBLe cruise) : Air-sea fluxes of biogenic bromine from the tropical and North Atlantic Ocean

kayo
Download Presentation

Organo-halogens and air sea transfer during MAP

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Organo-halogens and air sea transfer during MAP Simultaneous GC-MS measurements of iodocarbons & bromocarbons in air & surface seawater => 2 papers (combined with data from the RHaMBLe cruise): Air-sea fluxes of biogenic bromine from the tropical and North Atlantic Ocean L. J. Carpenter, C.E. Jones, R. M. Dunk and K.E. Hornsby - Submitted to ACP Sea-air fluxes of volatile organic iodine compounds from the North Atlantic Ocean Charlotte E. Jones, Karen E. Hornsby, Rachel M. Dunk, Gordon B. McFiggans, Roberto Sommariva, Roland von Glasow and Lucy J. Carpenter - Article in preparation MAP Final Meeting, Dublin, Dec 2008 Charlotte Jones, Karen Hornsby & Lucy Carpenter

  2. Air-sea fluxes of biogenic bromine from the tropical and North Atlantic Ocean -MAP bromocarbon fluxes Surface seawater CHBr3 & CH2Br2 concentrations from the MAP cruise Chl a image from MODIS chlorophyll ocean colour satellite, weekly composite from 26 June–1 July 2006. Chlorophyll is blue when concentrations are low, increasing through green and yellow to high concentrations at orange and red

  3. Air-sea fluxes of biogenic bromine from the tropical and North Atlantic Ocean - RHaMBLe bromocarbon fluxes Surface seawater CHBr3 & CH2Br2 concentrations from the RHaMBLe cruise Chl a image from MODIS chlorophyll ocean colour satellite, weekly composite from 20-26 May 2007.

  4. Air-sea fluxes of biogenic bromine from the tropical and North Atlantic Ocean CHBr3 & CH2Br2 fluxes increase in the order: Open ocean < continental shelf < upwelling < coastal

  5. Sea-air fluxes of volatile organic iodine compounds from the N. Atlantic Ocean During MAP (& RHaMBLe) we made truly simultaneous air & seawater measurements of iodocarbons such as CH2ICl & CH2I2

  6. Volatile iodocarbons - contribution to the global iodine budget Based on average fluxes from MAP & RHaMBLe datasets

  7. Model of Turbulent Vertical Mixing in the Oceanic Boundary Layer - used to correct our sub-surface CH2ICl & CH2I2 concentrations into equivalent surface concentrations Model generates time-resolved depth profiles of CH2I2 & CH2ICl within the top 150 m of the water column as a function of physical ocean & atmospheric parameters - mainly controlled by light attenuation within the water column & wind shear

  8. CH2I2 sea-air fluxes from the Mauritanian upwelling region of the RHaMBLe Cruise • Original mean CH2I2 flux from upwelling waters = 14.7 nmol m-2 d-1 • Mean CH2I2 flux after correcting surface seawater [CH2I2] using OML model = 12.0 nmol m-2 d-1 • i.e. using sub-surface seawater [CH2I2] leads to an over-estimation of the CH2I2 flux of on average around 32%

  9. CH2ICl sea-air fluxes from the Mauritanian upwelling region of the RHaMBLe Cruise • Original mean CH2ICl flux from upwelling waters = 21.6 nmol m-2 d-1 • Mean CH2ICl flux after correcting surface seawater [CH2ICl] using OML model = 21.3 nmol m-2 d-1 • i.e. in the Mauritanian upwelling waters using sub-surface seawater [CH2ICl] to calculate the sea-air flux does not lead to significant over- or under- estimation of the flux when averaged over a few days

  10. Organo-halogens and air sea transfer during MAP Air-sea fluxes of biogenic bromine from the tropical and North Atlantic Ocean L. J. Carpenter, C.E. Jones, R. M. Dunk and K.E. Hornsby - Submitted to ACP Sea-air fluxes of volatile organic iodine compounds from the North Atlantic Ocean Charlotte E. Jones, Karen E. Hornsby, Rachel M. Dunk, Gordon B. McFiggans, Roberto Sommariva, Roland von Glasow and Lucy J. Carpenter - Article in preparation MAP Final Meeting, Dublin, Dec 2008 Charlotte Jones, Karen Hornsby & Lucy Carpenter

  11. Effect of different attenuation coefficients – CH2I2

  12. Effect of different attenuation coefficients– CH2ICl

  13. Relationship between chl a & attenuation coefficient kz (upwelling) 0.29 = low chl a upwelling 0.8-2.0 mg/m3 0.40 = moderate chl a upwelling 2.0-4.0 mg/m3 0.53 = high chl a upwelling 5.0-8.0 mg/m3 0.65 = high chl a upwelling 9.7 mg/m3 0.80 = maximum chl a upwelling 16.2 mg/m3

More Related