Paper Harvest Report

Date range: June 05, 2026

2 top-tier papers selected out of 72 total publications

Today’s Highlights

Two papers from Geophysical Research Letters stand out today. A study of Alaska’s Beaufort Sea coast finds that supra-permafrost groundwater is a dominant late-season source of reactive, ancient dissolved organic matter to Arctic lagoons — with carbon ages of 640–1,020 years BP — a key finding for Arctic coastal carbon budgets as permafrost thaws. A paleoclimate study reveals that the historic 1962–1963 extreme wet-to-dry whiplash in South China’s pre-flood season had a return period of 979 years and was amplified roughly 71-fold by the 1963 Agung volcanic eruption through weakened Hadley circulation, underscoring the interplay between natural forcing and internal variability in regional flood and drought extremes.

Table of Contents

  1. Today’s Highlights
  2. Top-Tier Journal Papers
    1. Elucidating the Reactivity and Fate of Dissolved Organic Matter in Groundwater Entering the Alaska Beaufort Sea Coast Using 14C Ramped Oxidation
    2. Volcanic Forcing Amplifies Extreme Wet‐to‐Dry in Pre‐Flood South China Driven by Internal Variability
  3. Statistics
    1. Papers by journal
  4. Filtering Criteria

Top-Tier Journal Papers

Elucidating the Reactivity and Fate of Dissolved Organic Matter in Groundwater Entering the Alaska Beaufort Sea Coast Using 14C Ramped Oxidation

Authors: C. T. Connolly, R. G. M. Spencer, J. W. McClelland

Journal: Geophysical Research Letters · DOI: 10.1029/2025gl121357

Matched topics: river, coastal

Supra‐permafrost groundwater (SPGW) is a significant but understudied source of dissolved organic matter (DOM) to Arctic coastal systems. We applied ramped pyrolysis/oxidation (RPO) with Δ14C and δ13C isotopic analysis to assess DOM reactivity and origin in SPGW, river, and lagoon waters along the Alaska Beaufort Sea coast. Activation energy (E) profiles revealed shared low‐E and mid‐E components (∼150, 170, 185 kJ mol−1), underscoring compositional ubiquity across sites. However, SPGW exhibited a pronounced peak at 170 kJ mol−1, indicative of biodegradable carbon, while lagoon DOM showed a high‐E peak at 204 kJ mol−1, suggesting oxidative aging and stabilization. Isotopic signatures signal SPGW (640–1,020 yBP) and lagoon DOM (745–995 yBP) were derived from older carbon pools, contrasting the modern signatures of riverine DOM. These results highlight SPGW as a dominant late‐season source of reactive DOM to lagoons, demonstrating a novel framework for tracing DOM transformation and fate in Arctic coastal environments.

Volcanic Forcing Amplifies Extreme Wet‐to‐Dry in Pre‐Flood South China Driven by Internal Variability

Authors: Qi Wen, Yan Li, Mengying Du, Jiahao Li, Zhilan Wang, Xiaodan Guan

Journal: Geophysical Research Letters · DOI: 10.1029/2025gl121489

Matched topics: flood, drought

Dry‐wet whiplash events profoundly impact society and the environment, yet their attribution remains poorly understood. This study reveals that the unprecedented interannual wet‐to‐dry transition (return period: 979.2 years) in South China’s 1962–1963 pre‐flood season is co‐driven by internal variability and volcanic forcing. The 1962 extreme wetness is dominated by internal variability, with atmospheric circulation explaining 96% of the variability. The 1963 extreme drought is intensified by volcanic forcing by a factor of ∼71 relative to volcanically inactive periods. The 1963 Agung eruption cools the tropical Southern Hemisphere, weakens the Hadley circulation, and triggers subsidence that worsens the drought over South China. Our findings highlight the decisive role of natural variability in driving this historic event and offer key insights for future climate risk assessment.

Statistics

Metric Count
Journals searched 11
Total papers fetched 72
Passed deterministic filter 8
After LLM relevance filtering 2
Rejected (not relevant) 6
AI for Science items picked 0

Papers by journal

Journal Papers
Geophysical Research Letters 2

Filtering Criteria

Topics: hydrology, hydrologic model, river, runoff, streamflow, reservoir, water management, flood, drought, seasonal, land surface model, climate change, hydropower, surface water, irrigation, earth system model, estuary, coastal, freshwater discharge, river plume, ocean biogeochemistry, marine heatwave, paleohydrology, paleoclimate, Quaternary, Holocene, Pleistocene, fluvial geomorphology, river terrace, loess, drainage network, river capture, landscape evolution, luminescence dating

Fields: engineering, environmental science, computer science, geology, geography