Abstract A long‐term daily streamflow data set, covering the period from 1925 to 2013, was compiled for Lena River basin, with an average record length of 49 years. Time series mean annual flow (MADF) and extreme (maximum, Q max , minimum, min ) flows were subject trend detection change point analysis. Significant changes result mostly rapid “breakpoint” homogeneity disruptions. Thirty one time showed trends in MADF, 10, 32 55 records nonzero significant at p ≤ 0.05. Upward prevail both...

Abstract. Large Arctic river basins experience substantial variability in climatic, landscape, and permafrost conditions. However, the processes behind observed changes at scale of these are relatively poorly understood. While most studies have been focused on “Big 6” rivers – Ob', Yenisey, Lena, Mackenzie, Yukon, Kolyma few or no assessments exist for small medium-sized basins, such as Yana Indigirka River basins. Here, we provide a detailed analysis streamflow data from 22 hydrological...

Abstract Aufeis, also known as an icing or naled, is accumulation of ice that forms primarily during winter when water expelled onto frozen ground surfaces and freezes in layers. Process‐oriented aufeis research initially expanded the 20 th century, but recent interest changing hydrological conditions permafrost regions has rejuvenated this field. Despite its societal relevance, controls on distribution dynamics are not well defined impedes projections variation size expected to accompany...

The transfer of water and energy fluxes between the ground atmosphere is influenced by soil moisture (SM), which an important factor in land surface dynamics. Accurate representation SM over permafrost-affected regions remains challenging. Leveraging blended from microwave satellites, this study examines potential for satellite assimilation to enhance LSM (Land Surface Model) seasonal Ensemble Kalman Filter (EnKF) used integrate data across Iya River Basin, Russia. Considering permafrost,...

Based on the analysis of Landsat satellite images over period 2013–2019, number (6683) and total area (4529 km2) giant aufeis fields (area ≥ 0.1 were estimated for territory North-Eastern Eurasia. The contribution runoff to river streamflow in different seasons was calculated 58 hydrological gauges 523–526,000 km2). glaciers water balance is compared. resources vary from 0.4 4.25 km3 (or 3.7–11 mm) individual basins large rivers. They are at least 10.6 or 5 mm depth average study area....

Abstract. A detailed spatial geodatabase of aufeis (or naled in Russian) within the Indigirka River watershed (305 000 km2), Russia, was compiled from historical Russian publications (year 1958), topographic maps (years 1970–1980s) and Landsat images 2013–2017). Identification by late spring performed with a semi-automated approach according to Normalized Difference Snow Index (NDSI) additional data. After this, cross-reference index set for each field link compare satellite-based datasets....

Gold mining generates major environmental impacts like landscape degradation, accumulation of waste rock dumps, and water contamination by suspended solids. Russia ranks third in the world gold production, but impact has not been previously estimated for its vast northeastern part. This study provides a detailed overview land-cover changes associated with Magadan region (northeast Russia) 21st century, where alluvial production increased last 20 years. A long-term series Landsat Sentinel-2...

Giant aufeis fields, common in the Northeast of Russia, are indicators water exchange processes cryosphere. The development ideas about icing is relevant both from fundamental point view studying permafrost evolution, and practical – for hazard measures. Anmangynda River basin (aufeis glade area 7 km2) considered representative region, its studies have been carried out since 1962. In 2022, during period maximum thawing active layer Electrical Resistivity Tomography (ERT) soundings were at...

Abstract. In 2018, 70 years have passed since the beginning of observations at Kolyma Water-Balance Station (KWBS), a unique scientific research hydrological and permafrost catchment. The volume duration (50 continuous years) hydrometeorological standard experimental data, characterizing natural conditions processes occurring in mountainous conditions, significantly exceed any counterparts elsewhere world. data are representative territory North-East Russia. 1997, station was terminated,...

With permafrost warming, the observed discharge of Kolyma River in northeastern Siberia decreased between 1930s and 2000; however, underlying mechanism is not well understood. To understand hydrological changes River, it important to analyze long-term hydrometeorological features, along with active layer thickness. A coupled biogeochemical model was used due warming during 1979–2012, simulated results were validated satellite-based products situ observational records. The increase thickness...

The huge Anmangynda aufeis is located in the valley of river same name Magadan region North-East Russia. This only world site with a 30-years period ground-based observations (1962–1991). materials these were supplemented data obtained from analysis Landsat and Sentinel satellite images for 2000–2021, as well results field investigations carried out 2020–2021. long-term variability maximum area, volume average thickness ice, dynamics formation destruction ice cold warm periods year analyzed....

This research presents a comprehensive environmental assessment of small mountain permafrost catchment the Anmangynda River in Upper Kolyma Highland (Northeastern Asia) over period 2021–2023. The study reveals significant diversity climatic, geocryological, and hydrogeological conditions within this confined area, emphasizing need for extensive field data collection monitoring vast regions with limited availability. Key findings include variations ground temperature, maximum seasonal thaw...

Arctic rivers and water resources currently experience significant hydrological changes due to climate change global warming. The flow regime alteration in strongly influences the conservation sustainability of native biodiversity riverine ecosystem. major characteristics daily monthly seven arctic has been assessed this study. (40–120 years) at outlet Lena River, Yenisey Kolyma Ob' River Russia; Yukon USA; Mackenzie Canada; Tana Norway was used. Except for rest these have regulated. In...

Climate warming and anthropogenic impact causes transformation of geocryological conditions in the river basins North-East Russia. Changes thickness active layer, configuration taliks, types landscapes other factors lead to water exchange processes between surface groundwater runoff. This is manifested seasonal redistribution components balance, accelerated melting aufeis, change ratio waters different genesis structure As a result, natural risks that affect safe efficient development...

Giant aufeis fields are the indicators of water exchange processes in permafrost zone. The study dynamics is relevant to assessing state cryosphere a changing climate. Anmangynda which forms upstream Kolyma River basin, was as large 6.8 km 2 last century and considered representative mountainous territories northeast Russia. In recent decades, there have been significant changes formation regime that require updating understanding processes. historical observational data obtained 1962-1990...

Gigantic aufeis fields serve as indicators of water exchange processes within the permafrost zone and are important in assessing state cryosphere a changing climate. The Anmangynda aufeis, located upstream Kolyma River basin, is present mountainous regions Northeast Eurasia. Recent decades have witnessed significant changes formation patterns, necessitating comprehensive understanding cryospheric processes. objective study, conducted 2021–2022, was to examine structure its glade, aiming...

Abstract The hydrological implications of discontinuous permafrost thaw in peatland-dominated basins are not well understood. While there is evidence suggesting that permafrost-thaw-driven land cover change increases annual runoff and the ratio Taiga Plains northwestern Canada, few studies have evaluated impact on small to medium sized (<10 5 km 2 ) outside this ecoregion. Here, we assess runoff, ratio, precipitation trends for 34 basins, which 28 sporadic zones 6 adjacent permafrost-free...

The paper presents methods and results of creation the digital catalogue aufeises for Indigirka river basin made on basis Landsat images historical data. region under study is before hydrometric section GMS Vorontsovo, its area about 305 000 km2. Historical data were taken from Inventory naleds North-East USSR territory published in 1958 topographic maps. It includes estimated coordinates characteristics 897 with total 2064 Landsatbased identification 2013–2017 allowed making description...

Abstract Recent decades have seen a change in the runoff characteristics of Suntar River basin mountainous, permafrost, hard‐to‐reach region Eastern Siberia. This study aims to investigate and simulate formation processes, including factors driving recent changes hydrological response River, based on short‐term historical observations range hydrological, climatological landscape measurements conducted 1957–1959. The hydrograph model is applied as it has advantage using observed physical...

The study shows that the current network of hydrometeorological observation in permafrost zone Russia is insufficient to provide data for statistical approaches adopted at state level engineering surveys and calculations. alternative financially costly practically impossible expansion monitoring development hydrological research stations implementation new methods calculating streamflow characteristics based on mathematical modeling. Kolyma Water-Balance Station, first basin world a...

In the permafrost regions, where water filtration zone is limited by shallow active layer, surface flow forms a network of hollows, called «water tracks», oriented along slope gradient. Water tracks are clearly distinguished on satellite images, but poorly defined in field. The pattern depends geomorphological position, and geological conditions dominant cryogenic processes. Surface could occur during snowmelt heavy rains, when soil entirely frozen or fully saturated water. dry periods, form...