Common use of Hydrography Clause in Contracts

Hydrography. Observations during the JBSS 2016, 2017 and 2019 and assessment of historical data indicated an impact of the climate change in the Black Sea region. Temperatures in the so- Cold Intermediate L (CIL) have overwhelmingly exceeded 8 °С isotherm in Western and Central regions since 2009. The , in 2017. In contrast to 2017, both in 2016 and 2019 there was no CIL in "classical"definition as a layer bound by the 8 oC isotherm. The minimum temperature in the CIL in 2016, 2017 and 2019 was 8.28 ± 0.026, 7.62 ± 0.028 and 8.4 ± 0.1oC, respectively. The spatial and temporal variability of the position of upper border of the hydrogen sulphide zone in the deep part of the Black Sea is primarily determined by synoptic and seasonal variations of the hydrological structure of the sea waters. At the end of summer 2019 the upper border of the hydrogen sulphide zone in the Western and Central regions of the Black Sea fluctuated near the depth of 70 m. It went down to 135 m in Eastern region and to 150 m in South-Eastern part of the Black Sea. The upper boundary of hydrogen sulphide layervaried from σt =15,4 to σt =16,0 in the central part of the sea in 2017. This is

Hydrography. Observations during the JBSS 2016, 2017 and 2019 and assessment of historical data indicated an impact of the climate change in the Black Sea region. Temperatures in the so- Cold Intermediate L (CIL) have overwhelmingly exceeded 8 °С isotherm in Western and Central regions since 2009. The , in 2017. In contrast to 2017, both in 2016 and 2019 there was no CIL in "classical"definition classical" definition as a layer bound by the 8 oC 8oC isotherm. The minimum temperature in the CIL in 2016, 2017 and 2019 was 8.28 ± 0.026, 7.62 ± 0.028 and 8.4 ± 0.1oC, respectively. The spatial and temporal variability of the position of upper border of the hydrogen sulphide zone in the deep part of the Black Sea is primarily determined by synoptic and seasonal variations of the hydrological structure of the sea waters. At the end of summer 2019 the upper border of the hydrogen sulphide zone in the Western and Central regions of the Black Sea fluctuated near the depth of 70 m. It went down to 135 m in Eastern region and to 150 m in South-Eastern part of the Black Sea. The upper boundary of hydrogen sulphide layervaried from σt =15,4 to σt =16,0 in the central part of the sea in 2017. This is