A biological dipole variability in the Indian Ocean
The Indian Ocean Dipole (IOD) is a prominent mode of climate variability in the tropical Indian Ocean (IO). It exerts a significant influence on biological activities in this region. To elucidate the biological response to the IOD, previous research has introduced the biological dipole mode index (B...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2024-01-01
|
| Series: | Environmental Research Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1748-9326/ad1641 |
| _version_ | 1827386196476559360 |
|---|---|
| author | Gayan Pathirana Kyung Min Noh Dong-Geon Lee Huiji Lee Jong-Seong Kug |
| author_facet | Gayan Pathirana Kyung Min Noh Dong-Geon Lee Huiji Lee Jong-Seong Kug |
| author_sort | Gayan Pathirana |
| collection | DOAJ |
| description | The Indian Ocean Dipole (IOD) is a prominent mode of climate variability in the tropical Indian Ocean (IO). It exerts a significant influence on biological activities in this region. To elucidate the biological response to the IOD, previous research has introduced the biological dipole mode index (BDMI). However, the delineation of the region by the BDMI has limitations in capturing IOD-induced chlorophyll variations in the IO. By analyzing observational data and historical simulations from a Coupled Model Intercomparison Project model, this study shows that chlorophyll anomalies in the IO exhibit a dipole pattern in response to IOD. During the developing and mature phases of the positive IOD, we observe a substantial decrease in chlorophyll in the south-southwest of India, contrasting with a pronounced increase in the southeast of the IO. This response is attributed to anomalous southeasterly winds induced by IOD, which enhance nutrient upwelling in the southeastern IO and suppress it in the south-southwest of India, resulting in corresponding changes in surface chlorophyll blooms. Based on this finding, we propose a new biological dipole index that more robustly explains the surface chlorophyll response to IOD in the tropical IO. This study highlights the profound influence of IOD on oceanic chlorophyll and underscores the importance of a more comprehensive understanding of the associated biophysical interactions. |
| first_indexed | 2024-03-08T15:42:40Z |
| format | Article |
| id | doaj.art-487a1b1657d646ffa23a74901a70fbc3 |
| institution | Directory Open Access Journal |
| issn | 1748-9326 |
| language | English |
| last_indexed | 2024-03-08T15:42:40Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Environmental Research Letters |
| spelling | doaj.art-487a1b1657d646ffa23a74901a70fbc32024-01-09T14:36:56ZengIOP PublishingEnvironmental Research Letters1748-93262024-01-0119101407010.1088/1748-9326/ad1641A biological dipole variability in the Indian OceanGayan Pathirana0https://orcid.org/0000-0002-4670-579XKyung Min Noh1https://orcid.org/0000-0003-4233-4490Dong-Geon Lee2Huiji Lee3https://orcid.org/0009-0000-8753-2701Jong-Seong Kug4https://orcid.org/0000-0003-2251-2579Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH) , Pohang, Republic of Korea; Department of Oceanography and Marine Geology, FMST, University of Ruhuna , Matara, Sri LankaDivision of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH) , Pohang, Republic of Korea; Department of Atmospheric Sciences, Yonsei University , Seoul, Republic of KoreaDivision of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH) , Pohang, Republic of KoreaDivision of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH) , Pohang, Republic of KoreaDivision of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH) , Pohang, Republic of KoreaThe Indian Ocean Dipole (IOD) is a prominent mode of climate variability in the tropical Indian Ocean (IO). It exerts a significant influence on biological activities in this region. To elucidate the biological response to the IOD, previous research has introduced the biological dipole mode index (BDMI). However, the delineation of the region by the BDMI has limitations in capturing IOD-induced chlorophyll variations in the IO. By analyzing observational data and historical simulations from a Coupled Model Intercomparison Project model, this study shows that chlorophyll anomalies in the IO exhibit a dipole pattern in response to IOD. During the developing and mature phases of the positive IOD, we observe a substantial decrease in chlorophyll in the south-southwest of India, contrasting with a pronounced increase in the southeast of the IO. This response is attributed to anomalous southeasterly winds induced by IOD, which enhance nutrient upwelling in the southeastern IO and suppress it in the south-southwest of India, resulting in corresponding changes in surface chlorophyll blooms. Based on this finding, we propose a new biological dipole index that more robustly explains the surface chlorophyll response to IOD in the tropical IO. This study highlights the profound influence of IOD on oceanic chlorophyll and underscores the importance of a more comprehensive understanding of the associated biophysical interactions.https://doi.org/10.1088/1748-9326/ad1641Indian Ocean Dipolebiophysical interactionphytoplankton |
| spellingShingle | Gayan Pathirana Kyung Min Noh Dong-Geon Lee Huiji Lee Jong-Seong Kug A biological dipole variability in the Indian Ocean Environmental Research Letters Indian Ocean Dipole biophysical interaction phytoplankton |
| title | A biological dipole variability in the Indian Ocean |
| title_full | A biological dipole variability in the Indian Ocean |
| title_fullStr | A biological dipole variability in the Indian Ocean |
| title_full_unstemmed | A biological dipole variability in the Indian Ocean |
| title_short | A biological dipole variability in the Indian Ocean |
| title_sort | biological dipole variability in the indian ocean |
| topic | Indian Ocean Dipole biophysical interaction phytoplankton |
| url | https://doi.org/10.1088/1748-9326/ad1641 |
| work_keys_str_mv | AT gayanpathirana abiologicaldipolevariabilityintheindianocean AT kyungminnoh abiologicaldipolevariabilityintheindianocean AT donggeonlee abiologicaldipolevariabilityintheindianocean AT huijilee abiologicaldipolevariabilityintheindianocean AT jongseongkug abiologicaldipolevariabilityintheindianocean AT gayanpathirana biologicaldipolevariabilityintheindianocean AT kyungminnoh biologicaldipolevariabilityintheindianocean AT donggeonlee biologicaldipolevariabilityintheindianocean AT huijilee biologicaldipolevariabilityintheindianocean AT jongseongkug biologicaldipolevariabilityintheindianocean |