A satellite-derived re-analysis of surface-ocean pH variability in the coastal waters of India.

Saved in:

Bibliographic Details
Title:	A satellite-derived re-analysis of surface-ocean pH variability in the coastal waters of India.
Authors:	Vase, Vinaya Kumar¹ v.vinaykumarvs@gmail.com, Kumar, Rajan¹, Rahangdale, Shikha¹, Kartu, Sanjana¹, Solanki, Harshad¹, Jayaraman, Jayasankar¹, Kumar, Ratheesh¹, George, Grinson¹
Source:	Current Science (00113891). 6/25/2026, Vol. 130 Issue 12, p1077-1086. 10p.
Subjects:	pH effect, Ocean acidification, Climate change, Coasts, Remote sensing, Marine ecology
Geographic Terms:	India
Abstract:	Monitoring pH variations in coastal waters is essential for maintaining marine life and developing strategies to combat ocean acidification caused by climate change. The present study examines pH changes on interannual and seasonal scales along the northwest (NW), southwest (SW), southeast (SE), and northeast (NE) coasts of India over 30 years (1993-2022) using satellite data. Results reveal a significant decline in pH levels (R² = 0.727) across Indian coastal waters, with notable regional differences. The northeastern coast showed the greatest pH stability and the smallest decrease (R² = 0.798), while the southwestern coast experienced the highest variability (R² = 0.490). These regional pH fluctuations suggest varying resilience to ocean acidification. The NE and SW coasts, with higher variability, may be more susceptible to environmental changes, underscoring the importance of targeted monitoring and mitigation measures. In contrast, the more stable trends along the SE and NW coasts present opportunities to explore long-term resilience mechanisms. Seasonal fluctuations were evident everywhere, with winter consistently showing higher pH values and monsoon seasons the lowest. Principal component analysis indicated that the first two components accounted for 85.7% of the variance, highlighting factors such as seasonal river inflows, biological activity, and monsoonal freshwater input. Overall, these findings emphasise the importance of region-specific coastal management strategies to address climate change impacts and human pressures, while also providing a baseline for tracking future ocean acidification trends and assessing their effects on marine biodiversity and ecosystem services [ABSTRACT FROM AUTHOR]
	Copyright of Current Science (00113891) is the property of Indian Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database:	Engineering Source

Description
Abstract:	Monitoring pH variations in coastal waters is essential for maintaining marine life and developing strategies to combat ocean acidification caused by climate change. The present study examines pH changes on interannual and seasonal scales along the northwest (NW), southwest (SW), southeast (SE), and northeast (NE) coasts of India over 30 years (1993-2022) using satellite data. Results reveal a significant decline in pH levels (R² = 0.727) across Indian coastal waters, with notable regional differences. The northeastern coast showed the greatest pH stability and the smallest decrease (R² = 0.798), while the southwestern coast experienced the highest variability (R² = 0.490). These regional pH fluctuations suggest varying resilience to ocean acidification. The NE and SW coasts, with higher variability, may be more susceptible to environmental changes, underscoring the importance of targeted monitoring and mitigation measures. In contrast, the more stable trends along the SE and NW coasts present opportunities to explore long-term resilience mechanisms. Seasonal fluctuations were evident everywhere, with winter consistently showing higher pH values and monsoon seasons the lowest. Principal component analysis indicated that the first two components accounted for 85.7% of the variance, highlighting factors such as seasonal river inflows, biological activity, and monsoonal freshwater input. Overall, these findings emphasise the importance of region-specific coastal management strategies to address climate change impacts and human pressures, while also providing a baseline for tracking future ocean acidification trends and assessing their effects on marine biodiversity and ecosystem services [ABSTRACT FROM AUTHOR]
ISSN:	00113891
DOI:	10.18520/cs/v130/i12/1077-1086