Gas exchange estimates in the Peruvian upwelling regime biased by multi-day near-surface stratification

Fischer, Tim; Kock, Annette; Arévalo-Martínez, Damian L.; Dengler, Marcus; Brandt, Peter; Bange, Hermann W.

doi:https://doi.org/10.5194/bg-16-2307-2019

Articles | Volume 16, issue 11

https://doi.org/10.5194/bg-16-2307-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/bg-16-2307-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 16, issue 11

Research article

|

05 Jun 2019

Research article |

| 05 Jun 2019

Gas exchange estimates in the Peruvian upwelling regime biased by multi-day near-surface stratification

Tim Fischer, Annette Kock, Damian L. Arévalo-Martínez, Marcus Dengler, Peter Brandt, and Hermann W. Bange

Data sets

Physical oceanography from glider mission ifm03_depl08 Dengler, M. and Krahmann, G. https://doi.org/10.1594/PANGAEA.884278

Physical oceanography from glider mission ifm10_depl03 Dengler, M. and Krahmann, G. https://doi.org/10.1594/PANGAEA.884279

Physical oceanography from glider mission ifm06_depl02 Kanzow, T. and Krahmann, G. https://doi.org/10.1594/PANGAEA.884284

Physical oceanography from glider mission ifm07_depl08 Kanzow, T. and Krahmann, G. https://doi.org/10.1594/PANGAEA.884286

Physical oceanography from glider mission ifm08_depl05 Kanzow, T. and Krahmann, G. https://doi.org/10.1594/PANGAEA.884281

Physical oceanography from glider mission ifm11_depl04 Kanzow, T. and Krahmann, G. https://doi.org/10.1594/PANGAEA.884282

Physical oceanography from glider mission ifm12_depl01 Kanzow, T. and Krahmann, G. https://doi.org/10.1594/PANGAEA.884283

Physical oceanography from glider mission ifm03_depl09 Kanzow, T. and Krahmann, G. https://doi.org/10.1594/PANGAEA.887703

Nitrous oxide measured on water bottle samples during METEOR cruise M91 Kock, A. and Bange, H.W. https://doi.org/10.1594/PANGAEA.858178

Physical oceanography during METEOR cruise M91 Krahmann, G. and Bange, H.W. https://doi.org/10.1594/PANGAEA.858090

Short summary

We investigated air–sea gas exchange in oceanic upwelling regions for the case of nitrous oxide off Peru. In this region, routine concentration measurements from ships at 5 m or 10 m depth prove to overestimate surface (bulk) concentration. Thus, standard estimates of gas exchange will show systematic error. This is due to very shallow stratified layers that inhibit exchange between surface water and waters below and can exist for several days. Maximum bias occurs in moderate wind conditions.