CHANGES IN THE HYDROCHEMISTRY OF THE BLACK-SEA INFERRED FROM WATER DENSITY PROFILES

Date

1992-09-10

Author

TUĞRUL, SÜLEYMAN
BASTURK, O
SAYDAM, C
Yılmaz, Ayşen

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

200
views

0
downloads

DURING the past two decades, catastrophic changes have occurred in the Black Sea ecosystem: the influx of pollution from the major rivers has caused intense eutrophication at the northwest coastal margin1, and fish stocks have collapsed throughout the sea2. The hydrochemical details of these events are still poorly understood3-7, and a way needs to be found to distinguish long-term variations from short-term natural fluctuations3,4 if future management of the Black Sea ecosystem is to be successful. We show here that a coherent description may be achieved by analysing the hydrochemical data as a function of water density rather than depth. Our findings suggest that, contrary to the suggestion of Murray et al.3, the upper boundary of the low-lying anoxic waters has remained stationary since 1969, whereas the intermediate suboxic zone has enlarged, reducing the overall depth of the oxygenated upper waters by approximately 20 m. Moreover, a long-term increase in the nitrate concentration and a concomitant decrease in the silicate and ammonia concentrations in this upper layer are indicative of the considerable changes taking place in the biochemical regime of the Black Sea.

Subject Keywords

Multidisciplinary Sciences

URI

https://hdl.handle.net/11511/30237

Journal

NATURE

DOI

https://doi.org/10.1038/359137a0

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Altitude adaptation in Tibetans caused by introgression of Denisovan-like DNA Huerta-Sanchez, Emilia; et. al. (Springer Science and Business Media LLC, 2014-08-14) As modern humans migrated out of Africa, they encountered many new environmental conditions, including greater temperature extremes, different pathogens and higher altitudes. These diverse environments are likely to have acted as agents of natural selection and to have led to local adaptations. One of the most celebrated examples in humans is the adaptation of Tibetans to the hypoxic environment of the high-altitude Tibetan plateau(1-3). A hypoxia pathway gene, EPAS1, was previously identified as having the...
Dataset on the Marine Sustainability in the United Arab Emirates Gülseven, Osman (Elsevier BV, 2020-08-01) This data compiles the relevant indicators on measuring the UAE's attainments towards sustaining marine life and coastal ecosystems. Those indicators are compiled from three databases, namely from the United Nations, BertelsmannStiftung (BS) Foundation, and the Ocean Health Index (OHI). While the UN and BS indicators are widely accepted in measuring sustainability, many of the indicators in these databases are ambiguous and incomplete. The data from OHI is complete and offers a better perspective on measuri...
Recent dramatıc changes in the Black Sea ecosystem the reason for the sharp decline in Turkish anchovy fisheries Kıdeyş, Ahmet Erkan (1994-01-01) As a result of eutrophication caused by increased nutrient input via major rivers during the last few decades, the Black Sea ecosystem has been subject to extreme changes in recent years. These changes first became evident in the 1980's, with abnormal phytoplankton blooms and a large increase in medusae (Aurelia aurita) biomass. Then, the introduction of a new species (a lobate ctenophore, Mnemiopsis sp.) into the Black Sea radically affected the whole ecosystem. This species competes with anchovy for the e...
Changes of Eutrofication Indicator Parameters (TP, DIN, Chl-a and TRIX) in the Cilician Basin (Northeast Mediterranean) TUĞRUL, SÜLEYMAN; Uysal, Zahit; Erdogan, Emine; Yucel, Nebil (2011-01-01) Eutrophication processes and changes in coastal ecosystem are determined by the coastal/open sea interactions and rates of nutrient pollution. The Cilician Basin shelf waters are affected not only by intense industrial activities and increased population, but also by complex atmosphere-sea-land interactions. There is a recognizable difference between water qualities of Mersin bay coastal and the Cilician open waters depleted in nutrients. Eutrophic conditions have developed in the eastern bay shallow waters...
Changes in precipitation climatology for the Eastern Mediterranean using CORDEX RCMs, NHRCM and MRI-AGCM Mesta, Buket; Sasaki, Hidetaka; Nakaegawa, Tosiyuki; Kentel Erdoğan, Elçin (2022-07-01) © 2022Mediterranean Basin is expected to be one of the regions most severely impacted by global climate change. However, the complex interactions of driving forces of climate in the region create a challenge for climate projections for the future. Findings from climate change studies support the inter-model and inter-regional variability of projections on climate change impacts. On the other hand, the studies on the evaluation of the simulation skills of high-resolution climate models for the region particu...

Citation Formats

S. TUĞRUL, O. BASTURK, C. SAYDAM, and A. Yılmaz, “CHANGES IN THE HYDROCHEMISTRY OF THE BLACK-SEA INFERRED FROM WATER DENSITY PROFILES,” NATURE, pp. 137–139, 1992, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30237.