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The Development of Climate Science of the Baltic Sea Region  

Anders Omstedt

Dramatic climate changes have occurred in the Baltic Sea region caused by changes in orbital movement in the earth–sun system and the melting of the Fennoscandian Ice Sheet. Added to these longer-term changes, changes have occurred at all timescales, caused mainly by variations in large-scale atmospheric pressure systems due to competition between the meandering midlatitude low-pressure systems and high-pressure systems. Here we follow the development of climate science of the Baltic Sea from when observations began in the 18th century to the early 21st century. The question of why the water level is sinking around the Baltic Sea coasts could not be answered until the ideas of postglacial uplift and the thermal history of the earth were better understood in the 19th century and periodic behavior in climate related time series attracted scientific interest. Herring and sardine fishing successes and failures have led to investigations of fishery and climate change and to the realization that fisheries themselves have strongly negative effects on the marine environment, calling for international assessment efforts. Scientists later introduced the concept of regime shifts when interpreting their data, attributing these to various causes. The increasing amount of anoxic deep water in the Baltic Sea and eutrophication have prompted debate about what is natural and what is anthropogenic, and the scientific outcome of these debates now forms the basis of international management efforts to reduce nutrient leakage from land. The observed increase in atmospheric CO2 and its effects on global warming have focused the climate debate on trends and generated a series of international and regional assessments and research programs that have greatly improved our understanding of climate and environmental changes, bolstering the efforts of earth system science, in which both climate and environmental factors are analyzed together. Major achievements of past centuries have included developing and organizing regular observation and monitoring programs. The free availability of data sets has supported the development of more accurate forcing functions for Baltic Sea models and made it possible to better understand and model the Baltic Sea–North Sea system, including the development of coupled land–sea–atmosphere models. Most indirect and direct observations of the climate find great variability and stochastic behavior, so conclusions based on short time series are problematic, leading to qualifications about periodicity, trends, and regime shifts. Starting in the 1980s, systematic research into climate change has considerably improved our understanding of regional warming and multiple threats to the Baltic Sea. Several aspects of regional climate and environmental changes and how they interact are, however, unknown and merit future research.


History of the Hydrometeorological Service of Belarus  

Irina Danilovich, Raisa Auchynikava, and Victoria Slonosky

The first weather observations within the modern territory of Belarus go back to ancient times and are found as mentions of weather conditions in chronicles. Hydrometeorology in those times was not a defined science but connected to the everyday needs of people in different regions. In the period from 1000 to 1800, there were first efforts to document outstanding weather conditions and phenomena. They are stored in chronicles, books, and reports. The first instrumental observations started in the early 1800s. They have varying observing practices and periods of observations. The hydrometeorological network saw the active expansion of observations in the following century, but the network was destroyed at the beginning of the civil war (1917–1922). Five years later, hydrometeorological activity resumed, and the foundation of meteorological services of the Russian Soviet Federal Socialist Republic (RSFSR) was initiated. The next years saw a complicated Belarusian hydrometeorological service formation and reorganization. The meteorological bureau was formed in 1924, and this year is considered the official date of the Hydrometeorological Service of Belarus foundation, despite multiple changes in title and functions during its course. During the Great Patriotic War (1941–1945) people’s courage and efforts were directed to saving the existing network of hydrometeorological observations and providing weather services for military purposes. The postwar period was characterized by the implementation of new methods of weather forecasting and new forms of hydrometeorological information. Later decades were marked by the invention and implementation of new observational equipment. The Hydrometeorological Service of Belarus in this period was a testing ground within the Soviet Union for the development of meteorological tools and devices. The current Hydrometeorological Service of Belarus is described as an efficient, modern-equipped, and constantly developing weather service.