# Tree rings show Lake Baikal basin streamflow rebound is the sharpest in 343 years

- Published: 2026-11-15 17:14 UTC
- Section: Planet › Ocean & water
- Tags: Lake Baikal streamflow, tree-ring reconstruction, Selenga River, Angara River, 343-year record, Baikal water balance, Arctic warming slowdown, Geophysical Research Letters, hydroclimatic baseline
- URL: https://realtech.media/news/rt-4fa1f40e19329a865c9888c9_tree_rings_show/

**A 343-year tree-ring reconstruction of Selenga and Angara flow shows Baikal-basin streamflow rising about 80% over the last decade after intermittent 20th-century drying.**

![Tree rings show Lake Baikal basin streamflow rebound is the sharpest in 343 years](https://realtech.media/media/2026/11/643eed0c31f49ee7.webp)
*Interesting Engineering*

Shijie Wang of Yunnan University and colleagues reconstructed 343 years of combined Selenga and Angara River streamflow for Lake Baikal from tree rings, according to a study in Geophysical Research Letters. The reconstruction shows the most sustained recovery in the record over the last decade, an increase of about 80% [1]. Baikal holds about one-fifth of Earth's unfrozen surface freshwater [1].

## Tree-ring reconstruction of Baikal inflow and outflow

The lake's water balance depends on inflow from the Selenga and outflow through the Angara [1]. The team collected 52 tree-ring cores from pines near the lake and combined them with existing records from 12 additional sites. The result is a multi-century hydroclimatic baseline for the basin.

The reconstruction captures intermittent drying through the 20th century, including a streamflow decline of about 90% from high levels, consistent with long-term regional aridification [1]. About half of all extreme low-flow years occurred after 1900. A severe decline was recorded between 1995 and 2016.

## Recovery since 2017 and possible drivers

The trend then reversed sharply [1]. The authors identify 2017–2024 as the most pronounced recovery in the 343-year record, with streamflow reaching 145.2% of its long-term average. The recovery coincides with basin-wide vegetation greening and rising lake levels [1]. The climatic and ecological factors examined, including precipitation, temperature, soil moisture and snowmelt, together account for 59.3% of streamflow variability.

The authors also found relationships between streamflow and sea surface temperature and sea ice cover in the North Pacific and Arctic. Lower sea surface temperatures and more sea ice in the Bering, Chukchi, East Siberian and Okhotsk seas were associated with higher flow. They link the change to atmospheric circulation tied to a regional slowing of Arctic-amplified warming, which enhances moisture transport toward the basin [1]. Further climate modeling is needed to test this connection.

The authors have not determined whether the wet period is a sustained regime shift or a transient phase. They note that streamflow estimates for 2015–2024 extend beyond the instrumental calibration period, which adds uncertainty. In their view, projections based only on short instrumental records may not capture the basin's variability, and adaptive water management should account for non-stationary dynamics [1].

## Sources

1. [Geophysical Research Letters](https://doi.org/10.1029/2026GL124400)
2. [Interesting Engineering](https://interestingengineering.com/science/worlds-largest-fresh-water-lake-sees-sharpest-flow-rebound-in-343-years)

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Source: RealTech, realtech.media — https://realtech.media/news/rt-4fa1f40e19329a865c9888c9_tree_rings_show/