OceanRep
Items where Author is "Hahn, Johannes"
Number of items: 56.
2023
Hummels, R. , Hahn, J. and Karstensen, J.
and GEOMAR Physical Oceanography Department
(2023)
Mooring Processing Toolbox.
[Talk]
In: Ocean Sites Meeting - Best Practices. , 09.11.2023, Online .
2022
Devresse, Q., Becker, K. W. , Bendinger, A., Hahn, J. and Engel, A.
(2022)
Eddy-enhanced primary production sustains heterotrophic
microbial activities in the Eastern Tropical North Atlantic.
Biogeosciences (BG), 19
.
pp. 5199-5219.
DOI 10.5194/bg-19-5199-2022.
Tuchen, F. P. , Brandt, P. , Hahn, J. , Hummels, R. , Krahmann, G. , Bourlès, B., Provost, C., McPhaden, M. J. and Toole, J. M.
(2022)
Two Decades of Full-Depth Current Velocity Observations From a Moored Observatory in the Central Equatorial Atlantic at 0°N, 23°W.
Frontiers in Marine Science, 9
.
Art.Nr. 910979.
DOI 10.3389/fmars.2022.910979.
2021
Krahmann, G. , Arevalo-Martinez, D. L. , Dale, A. W. , Dengler, M. , Engel, A. , Glock, N., Grasse, P. , Hahn, J. , Hauss, H. , Hopwood, M. J. , Kiko, R. , Loginova, A. N. , Löscher, C. R. , Maßmig, M., Roy, A. S., Salvatteci, R., Sommer, S., Tanhua, T. and Mehrtens, H.
(2021)
Climate-Biogeochemistry Interactions in the Tropical Ocean: Data collection and legacy.
Frontiers in Marine Science, 8
.
Art.Nr. 723304.
DOI 10.3389/fmars.2021.723304.
Brandt, P. , Hahn, J. , Schmidtko, S. , Tuchen, F. P. , Kopte, R. , Kiko, R. , Bourlès, B., Czeschel, R. and Dengler, M.
(2021)
Atlantic Equatorial Undercurrent intensification counteracts warming-induced deoxygenation.
Nature Geoscience, 14
.
pp. 278-282.
DOI 10.1038/s41561-021-00716-1.
2020
Burmeister, K. , Lübbecke, J. F. , Brandt, P. , Claus, M. and Hahn, J.
(2020)
Fluctuations of the Atlantic North Equatorial Undercurrent and associated changes in oxygen transports.
Geophysical Research Letters, 47
(13).
Art.Nr. e2020GL088350.
DOI 10.1029/2020GL088350.
Sommer, S., Adam, N., Becker, K., Dale, A. W. , Hahn, J. , Kampmeier, M., Paulsen, M., Katzenmeier, S. and Körtzinger, A.
(2020)
Role of Eddies in the Carbon Pump of Eastern Boundary Upwelling Systems, REEBUS, Cruise No. M156, 03.07. – 01.08.2019 Mindelo (Cap Verde) – Mindelo .
.
Meteor Berichte, M156
.
Gutachterpanel Forschungsschiffe, Bonn, 53 pp.
DOI 10.2312/cr_m156.
2019
Foltz, G. R., Brandt, P. , Richter, I., Rodríguez-Fonseca, B., Hernandez, F., Dengler, M. , Rodrigues, R. R., Schmidt, J. O., Yu, L., Lefevre, N., Da Cunha, L. C., McPhaden, M. J., Araujo, M., Karstensen, J. , Hahn, J. , Martín-Rey, M., Patricola, C. M., Poli, P., Zuidema, P., Hummels, R., Perez, R. C., Hatje, V., Lübbecke, J. F. , Polo, I., Lumpkin, R., Bourlès, B., Asuquo, F. E., Lehodey, P., Conchon, A., Chang, P., Dandin, P., Schmid, C., Sutton, A., Giordani, H., Xue, Y., Illig, S., Losada, T., Grodsky, S. A., Gasparin, F., Lee, T., Mohino, E., Nobre, P., Wanninkhof, R., Keenlyside, N., Garcon, V., Sánchez-Gómez, E., Nnamchi, H., Drévillon, M., Storto, A., Remy, E., Lazar, A., Speich, S., Goes, M., Dorrington, T., Johns, W. E., Moum, J. N., Robinson, C., Perruche, C., de Souza, R. B., Gaye, A. T., López-Parages, J., Monerie, P. A., Castellanos, P., Benson, N. U., Hounkonnou, M. N., Duhá, J. T., Laxenaire, R. and Reul, N.
(2019)
The Tropical Atlantic Observing System.
Frontiers in Marine Science, 6
(206).
DOI 10.3389/fmars.2019.00206.
Bourlès, B. , Araujo, M. , McPhaden, M. J. , Brandt, P. , Foltz, G. R. , Lumpkin, R. , Giordani, H. , Hernandez, F. , Lefèvre, N. , Nobre, P. , Campos, E. , Saravanan, R. , Trotte‐Duhà, J., Dengler, M. , Hahn, J. , Hummels, R., Lübbecke, J. F. , Rouault, M. , Cotrim, L. , Sutton, A. , Jochum, M. and Perez, R. C.
(2019)
PIRATA: A Sustained Observing System for Tropical Atlantic Climate Research and Forecasting.
Earth and Space Science, 6
(4).
pp. 577-616.
DOI 10.1029/2018EA000428.
Berx, B., Cunningham, S., von Appen, W. J., Atamanchuk, D., Brown, P., Fraser, N., Hahn, J. , Jochumsen, K., Johnson, C., de Jong, F., Karstensen, J. , King, B., Lankhorst, M., Larsen, K. M. H., McDonagh, E., Moritz, M. and Yashayaev, I.
(2019)
Report on the observational potential of the TMAs.
.
AtlantOS Deliverable, D3.18
.
AtlantOS, 35 pp.
DOI 10.3289/atlantos_d3.18.
2018
Bourles, B., Brandt, P. , Lefevre, N. and Hahn, J.
(2018)
PIRATA data system upgrade Report.
.
AtlantOS Deliverable, D3.9
.
AtlantOS, 7 pp.
DOI 10.3289/AtlantOS_D3.9.
Bittig, H. C., Körtzinger, A. , Neill, C., van Ooijen, E., Plant, J. N., Hahn, J. , Johnson, K. S., Yang, B. and Emerson, S. R.
(2018)
Oxygen Optode Sensors: Principle, Characterization, Calibration, and Application in the Ocean.
Frontiers in Marine Science, 4
.
Art.No. 429.
DOI 10.3389/fmars.2017.00429.
Brandt, P. , Hahn, J. and Schmidtko, S.
(2018)
Drivers and mechanisms of thermocline oxygen changes in the eastern tropical North Atlantic.
[Invited talk]
In: Ocean Deoxygenation Conference 2018. , 03.-07.09.2018, Kiel, Germany .
Brandt, P. , Hahn, J. , Schmidtko, S. and Oschlies, A.
(2018)
Changes in the tropical Atlantic oxygen minimum zone in perspective of global ocean deoxygenation.
[Invited talk]
In: THEMES 2018 - Oceanic and atmospheric variability, from long-term trends to abrupt shifts. , 28.-30.11.2018, Venice, Italy .
Brandt, P. , Schmidtko, S. and Hahn, J.
(2018)
Oxygen changes in the tropical North Atlantic in connection to meridional overturning circulation and subtropical cell variability.
[Talk]
In: PIRATA 23 Meeting. , 22.10.-26.10.2018, Marseille, France .
Hahn, J. , Brandt, P. and Kemme, J.
(2018)
Eddy-driven oxygen supply to the eastern tropical North Atlantic oxygen minimum zone.
[Talk]
In: PIRATA 23 Meeting. , 22.10.-26.10.2018, Marseille, France .
2017
Hahn, J. , Brandt, P. , Schmidtko, S. and Krahmann, G.
(2017)
Decadal oxygen change in the eastern tropical North Atlantic.
Ocean Science, 13
(4).
pp. 551-576.
DOI 10.5194/os-13-551-2017.
Hahn, J. , Brandt, P. , Karstensen, J. and Körtzinger, A.
(2017)
Observations of oxygen variability in the eastern tropical North Atlantic.
[Poster]
In: PIRATA 22 - PREFACE - TAV Meeting. , 05.-10.11.2017, Fortaleza, Brasil .
Hahn, J. , Burmeister, K. , Brandt, P. , Körtzinger, A. , Duteil, O. and Schwarzkopf, F. U.
(2017)
A comprehensive data set to study the oxygen minimum zone in the eastern tropical North Atlantic.
[Poster]
In: GODAE OceanView International School ‘New Frontiers in Operational Oceanography’. , 02.10-13.10.2017, Mallorca, Spain .
2016
Hahn, J. , Brandt, P. , Schmidtko, S. and Krahmann, G.
(2016)
Interplay of oxygen and hydrography in the eastern tropical North Atlantic on decadal to multi-decadal time scales.
[Talk]
In: EGU General Assembly 2016. , 17.-22.04.2016, Vienna, Austria .
Brandt, P. , Hahn, J. , Schütte, F., Fischer, T. , Karstensen, J. , Greatbatch, R. J. , Dengler, M. , Körtzinger, A. , Krahmann, G. , Schmidtko, S. , Stramma, L. , Tanhua, T. and Visbeck, M.
(2016)
Oxygen variability in the eastern tropical North Atlantic oxygen minimum zone.
[Talk]
In: Lamont Doherty Earth Observatory at Columbia University. , 11.03.2016, Palisades, NY, USA .
2015
Karstensen, J. , Fiedler, B., Schütte, F., Brandt, P. , Körtzinger, A. , Fischer, G., Zantopp, R. J. , Hahn, J. , Visbeck, M. and Wallace, D. W. R.
(2015)
Open ocean dead zones in the tropical North Atlantic Ocean.
Biogeosciences (BG), 12
.
pp. 2597-2605.
DOI 10.5194/bg-12-2597-2015.
Hahn, J. , Brandt, P. and Krahmann, G.
(2015)
Meso- to submesoscale O2 variability in the
oxygen minimum zone of the eastern tropical North Atlantic.
[Poster]
In: EGU General Assembly 2015. , 12.–17.04.2015 , Vienna, Austria .
Brandt, P. , Bange, H. W. , Banyte, D., Dengler, M. , Didwischus, S. H., Fischer, T. , Greatbatch, R. J. , Hahn, J. , Kanzow, T., Karstensen, J. , Körtzinger, A. , Krahmann, G. , Schmidtko, S. , Stramma, L. , Tanhua, T. and Visbeck, M.
(2015)
On the role of circulation and mixing in the ventilation of oxygen minimum zones with a focus on the eastern tropical North Atlantic.
Biogeosciences (BG), 12
.
pp. 489-512.
DOI 10.5194/bg-12-489-2015.
Brandt, P. , Dengler, M. , Didwischus, S. H., Fischer, T. , Greatbatch, R. J. , Hahn, J. , Karstensen, J. , Körtzinger, A. , Krahmann, G. , Schmidtko, S. , Stramma, L. , Tanhua, T. and Visbeck, M.
(2015)
On the role of circulation and mixing in the ventilation of the oxygen minimum zone of the eastern tropical North Atlantic.
[Talk]
In: RSMAS. , 09.03.2015, Miami, Fla., USA .
2014
Hahn, J. , Brandt, P. , Greatbatch, R. J. , Krahmann, G. and Körtzinger, A.
(2014)
Oxygen variance and meridional oxygen supply in the Tropical North East Atlantic oxygen minimum zone.
Climate Dynamics, 43
(11).
pp. 2999-3024.
DOI 10.1007/s00382-014-2065-0.
Hahn, J. , Bittig, H. C., Krahmann, G. , Karstensen, J. , Brandt, P. and Körtzinger, A.
(2014)
In situ calibration procedure for Aanderaa optodes with a focus on glider oxygen measurements.
[Talk]
In: 6. EGO Meeting and Final Symposium of the COST Action ES0904. , 16.-17.06.2014, Kiel, Germany .
Hahn, J. , Brandt, P. , Greatbatch, R. J. , Krahmann, G. and Körtzinger, A.
(2014)
Oxygen Variance and Meridional Oxygen Supply in the Tropical North East Atlantic Oxygen Minimum Zone.
[Talk]
In: Ocean Sciences Meeting 2014. , 23.-28.02.2014, Honululu, Hawaii, USA .
Brandt, P. , Bange, H. W. , Banyte, D., Dengler, M. , Didwischus, S. H., Fischer, T. , Greatbatch, R. J. , Hahn, J. , Kanzow, T., Karstensen, J. , Körtzinger, A. , Krahmann, G. , Schmidtko, S. , Stramma, L. , Tanhua, T. and Visbeck, M.
(2014)
On the role of circulation and mixing in the ventilation of the oxygen minimum zone of the eastern tropical North Atlantic.
[Talk]
In: 1. International Conference AWA “Ecosystem approach to the management of fisheries and the marine environment in West African Waters”. , 11.12.2014, Dakar, Senegal .
Hahn, J. , Fischer, T. , Brandt, P. , Greatbatch, R. J. , Körtzinger, A. , Tanhua, T. , Visbeck, M. , Banyte, D., Dengler, M. and Krahmann, G.
(2014)
Oxygen Supply to the Tropical North East Atlantic Oxygen Minimum Zone.
[Talk]
In: SFB754 Colloquium. , 08.01.2014, Kiel, Germany .
2013
Fischer, T. , Hahn, J. , Brandt, P. , Greatbatch, R. J. , Körtzinger, A. , Tanhua, T. , Visbeck, M. , Banyte, D., Dengler, M. and Krahmann, G.
(2013)
Oxygen Supply to the Tropical North East Atlantic Oxygen Minimum Zone.
[Invited talk]
In: IOW Colloquium. , 18.11.2013, Rostock, Germany .
Hahn, J. , Brandt, P. , Greatbatch, R. J. , Krahmann, G. and Körtzinger, A.
(2013)
Current and Oxygen Variability in the Tropical North East Atlantic.
[Talk]
In: Tropical Atlantic Variability Meeting / PIRATA-18 Meeting . , 22. - 25.10.2013, Venice, Italy .
Brandt, P. , Greatbatch, R. J. , Claus, M. , Didwischus, S. H. and Hahn, J.
(2013)
Ventilation of the equatorial Atlantic.
[Talk]
In: EGU General Assembly 2013. , 07.-12.04.2013, Vienna, Austria .
Brandt, P. , Greatbatch, R. J. , Claus, M. , Didwischus, S. H. and Hahn, J.
(2013)
Ventilation of the equatorial Atlantic.
[Talk]
In: 3. Sino-German Symposium "Multidisciplinary Processes in Deep Oceans and Impacts on Climate and Coastal Environment". , 03.-06.09.2013, Qingdao, China .
Brandt, P. , Greatbatch, R. J. , Claus, M. , Didwischus, S. H. and Hahn, J.
(2013)
Ventilation of the equatorial Atlantic.
[Talk]
In: CLIVAR TAV-PIRATA Meeting. , 24.10.2013, Venice, Italy .
Hahn, J.
(2013)
Oxygen Variability and Eddy-driven
Meridional Oxygen Supply in the Tropical
North East Atlantic Oxygen Minimum Zone.
(PhD/ Doctoral thesis), Christian-Albrechts-Universität Kiel, Kiel, Germany, 129 pp.
Hahn, J. , Brandt, P. , Greatbatch, R. J. , Krahmann, G. and Körtzinger, A.
(2013)
O2 variability and Meridional Oxygen Supply in the Tropical North East Atlantic Oxygen Minimum Zone.
[Poster]
In: EGU General Assembly 2013. , 07.-12.04.2013, Vienna, Austria .
2012
Hahn, J. , Brandt, P. , Greatbatch, R. J. , Krahmann, G. and Körtzinger, A.
(2012)
O2 variance and meridional O2 supply in the Tropical North East Atlantic.
[Talk]
In: Tropical Atlantic Variability Meeting, PIRATA-17 Meeting . , 10.09.-15.09.2012, Kiel .
Hahn, J. , Brandt, P. , Greatbatch, R. J. , Körtzinger, A. , Krahmann, G. and Funk, A.
(2012)
O2 variance at intermediate depth in the central tropical Atlantic along 23°W.
[Poster]
In: EGU General Assembly 2012. , 22.-27.04.2012, Vienna, Austria .
Brandt, P. , Alevara Martinez, D., Dengler, M. , Didwischus, S. H., Funk, A., Hahn, J. , Hogue, B., Kemena, T., Kock, A. , Krahmann, G. , Martens, W., Martogli, N., Müller, M., Niehus, G., Papenburg, U., Pinck, A., Rother, K., Schlundt, M., Schütte, F., Tippenhauer, S., Vogt, M. and Zantopp, R. J.
(2012)
Physical and Biogeochemical Studies in the Subtropical and Tropical Atlantic.
.
Maria S. Merian-Berichte
.
DFG Senatskommission für Ozeanographie, Hamburg, Germany, 41 pp.
Brandt, P. , Greatbatch, R. J. , Claus, M. , Didwischus, S. H., Hormann, V., Funk, A., Hahn, J. , Krahmann, G. , Fischer, J. and Körtzinger, A.
(2012)
Ventilation of the equatorial Atlantic by the equatorial deep jets.
Journal of Geophysical Research: Oceans, 117
(C12).
C12015.
DOI 10.1029/2012JC008118.
Brandt, P. , Greatbatch, R. J. , Didwischus, S. H., Claus, M. , Funk, A., Hormann, V., Hahn, J. , Fu, Y., Dengler, M. and Toole, J. M.
(2012)
Ventilation of the Tropical Atlantic by Equatorial Deep Jets.
[Talk]
In: Ocean Sciences Meeting 2012. , 20.-24.02.2012, Salt Lake City, USA .
Brandt, P. , Greatbatch, R. J. , Didwischus, S. H., Claus, M. , Hahn, J. , Hormann, V., Funk, A., Fu, Y. and Dengler, M.
(2012)
Equatorial deep jets in the Atlantic Ocean.
[Talk]
In: EGU General Assembly 2012. , 22.-27.04.2012, Vienna, Austria .
2011
Brandt, P. , Brownell, D., Dengler, M. , Didwischus, S. H., Fehsenfeld, S., Fessler, S., Fischer, J. , Funk, A., Großkopf, T., Hahn, J. , Halm, H., Hormann, V., Koy, U., Krahmann, G. , Krupke, A., Melo, V., Müller, M., Niehus, G., Papenburg, U., Pinck, A., Schneider, A., Steinhoff, T., Stöven, T., Truscheit, T., Viera, N., von Neuhoff, H., Wagener, T., Wuttig, K. and Zantopp, R. J.
(2011)
Circulation and Oxygen Distribution in the Tropical Atlantic
Cruise No. 80, Leg 1; October 26 to November 23, 2009
Mindelo (Cape Verde) to Mindelo (Cape Verde).
.
Meteor-Berichte, M80/1
.
Leitstelle Deutsche Forschungsschiffe, Inst. f. Meereskunde, Hamburg, Germany, 49 pp.
DOI 10.2312/cr_m80_1.
Karstensen, J. , Czeschel, R., Hahn, J. , Schlundt, M. and Krahmann, G.
(2011)
In-situ calibration of Oxygen Optodes in the Southeast Pacific Oxygen Minimum Zone.
[Talk]
In: EGO 2011 - 5th EGO Meeting and Glider School. , 14.-18.03.2011, Las Palmas, Gran Canary .
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