Paper Harvest Report

Date range: July 11, 2026

4 top-tier papers selected out of 43 total publications

Today’s Highlights

A multi-scale earth system modeling study reveals that rural runoff — not local impervious surfaces — drives the most severe coastal urban flooding during hurricanes, with wetlands absorbing over 90% of rainfall–surge compounding effects. Atmospheric river research in the extratropical Andes shows that orographic lifting combined with surface humidity and terrain-modulated heat advection controls extreme precipitation intensification, key knowledge for flood hazard preparedness. A new iron-ratio proxy from the northern Tibetan Plateau closes a chronological gap in Quaternary glacial history, suggesting synchronous glacial intensification across the entire plateau at ~0.9 Ma during the Mid-Pleistocene Transition.

Table of Contents

  1. Today’s Highlights
  2. Top-Tier Journal Papers
    1. Significant Rural Contributions to Severe Coastal Urban Flooding Through Flow Connectivity
    2. What Drives Precipitation Intensification During Zonal Atmospheric Rivers Landfalling in the Extratropical Andes?
    3. Synchronous Advance of the Alpine Glaciation Across the Northern and Southern Tibetan Plateau During the Mid‐Pleistocene Transition
    4. Pervasive Summertime Nitrous Oxide Undersaturation in U.S. Lakes and Reservoirs
  3. Statistics
    1. Papers by journal
  4. Filtering Criteria

Top-Tier Journal Papers

Significant Rural Contributions to Severe Coastal Urban Flooding Through Flow Connectivity

Authors: Donghui Xu, Gautam Bisht, Dongyu Feng, Zeli Tan, Dalei Hao, Darren Engwirda et al.

Journal: Geophysical Research Letters · DOI: 10.1029/2026gl122550

Matched topics: river, runoff, flood, earth system model, coastal

Coastal cities are increasingly threatened by hurricane‐induced compound flooding. However, the relative contributions of rainfall‐surge interactions and other flood drivers, such as runoff from surrounding rural and local impervious areas, in shaping urban flooding remain unclear. Here, we use a multi‐scale Earth system modeling framework to disentangle the contributions of diverse flooding drivers. The results show that urban flooding is primarily affected by topographic factors (low elevation, flat slopes, and localized flow constrictions), rather than increased runoff from their impervious surfaces. Importantly, runoff from rural areas contributes more to severely flooded urban areas with inundation depth exceeding 1.7 m than local runoff. Although rainfall–surge interactions and sea‐level rise exacerbate inundation along the coastline, over 90% of the compounding effects are absorbed by wetlands. By resolving flooding processes across scales and components, this study emphasizes the role of runoff from surrounding rural areas in shaping zones of severe urban flooding.

What Drives Precipitation Intensification During Zonal Atmospheric Rivers Landfalling in the Extratropical Andes?

Authors: Dipjyoti Mudiar, Cristian Martinez‐Villalobos, Raul A. Valenzuela, Roberto Rondanelli

Journal: Geophysical Research Letters · DOI: 10.1029/2025gl119839

Matched topics: river, flood

The extratropical Andes, a hotspot for landfalling atmospheric rivers (ARs), are prone to extreme precipitation and related hydrological hazards, including floods and landslides. An improved understanding of the drivers of precipitation intensification during AR landfall is critical for hazard preparedness. Focusing on 50 zonally elongated ARs (ZARs), we demonstrate that precipitation amplification over the Andes is largely associated with strong ascent produced by orographic lifting of ZAR flow and further strengthened by the release of atmospheric instabilities. The efficient realization of these instabilities is linked to large surface relative humidity, particularly over regions with steep elevation gradients. We further demonstrate that ZAR‐related moisture convergence and terrain‐modulated heat advection in these regions lead to an increase in relative humidity over the steep Andean terrain. This study emphasizes that accurately estimating precipitation intensification and its spatial distribution during ZAR landfall requires an improved understanding of both moisture and heat transport to the extratropical Andes.

Synchronous Advance of the Alpine Glaciation Across the Northern and Southern Tibetan Plateau During the Mid‐Pleistocene Transition

Authors: Chengying Liu, Benhong Guo, Wenjiao Xiao, Zaijun Li, Linkai Wang, Fei Wang

Journal: Geophysical Research Letters · DOI: 10.1029/2026gl123753

Matched topics: river, Quaternary, Pleistocene, loess

Chronological studies of glacial sediments from the Shishapangma and Yarlung Tsangpo River valley indicate that Quaternary glaciation on the southern Tibetan Plateau commenced at ~0.75–0.83 Ma. However, the oldest glacial deposits in the northern plateau are dated to only ~0.46 Ma, markedly later than the Middle Pleistocene glacial intensification evidenced in southern plateau and loess archives. Here, we report an S‐ratio record — a proxy for ferrous iron content with potential links to glacial fluctuations — obtained from a drill core in the Tengger Desert on the northern piedmont of the Qilian Mountains. This record shows a pronounced rise at ~0.9 Ma, coincident with enhanced Fe²⁺‐bearing minerals in Kunlun Mountains loess and the earliest moraine deposits in the southern plateau. Collectively, these observations imply that alpine glacial activity may have intensified synchronously across the entire plateau during the Mid‐Pleistocene Transition, likely in response to global cooling and Tibetan Plateau uplift.

Pervasive Summertime Nitrous Oxide Undersaturation in U.S. Lakes and Reservoirs

Authors: Jake J. Beaulieu, Roy W. Martin, Michael G. McManus

Journal: Nature Communications · DOI: 10.1038/s41467-026-74705-6

Matched topics: reservoir, surface water

Lakes and reservoirs are estimated to be globally important sources of nitrous oxide (N₂O) to the atmosphere but recent evidence of N₂O uptake across a broad range of lakes have called the accuracy of emission estimates into question. Here, we use a new national-scale dataset of dissolved N₂O concentration and a Bayesian hierarchical model to predict summertime N₂O concentration and emission rates in 465,896 waterbodies in the conterminous U.S. (CONUS). We found that N₂O undersaturation was pervasive throughout the CONUS during the summer of 2017, with an estimated 72.9% (95% credible interval: 68.9–76.6%) of lakes functioning as N₂O sinks. The model predicts dissolved N₂O concentrations reasonably well based partly on interactions between nitrate concentration, waterbody surface area, and water temperature. Despite working with the largest aquatic N₂O dataset to date, our national-scale estimate of summertime N₂O emissions from CONUS lakes is poorly constrained, with a 95% credible interval ranging from net uptake to net emission (−282 to 482 metric tons N₂O summer⁻¹). Pervasive N₂O undersaturation in CONUS waterbodies during the summer highlights the need to revisit N₂O models which presume surface waters are a N₂O source.

Statistics

Metric Count
Journals searched 11
Total papers fetched 43
Passed deterministic filter 9
After LLM relevance filtering 4
Rejected (not relevant) 5
AI for Science items picked 0

Papers by journal

Journal Papers
Geophysical Research Letters 3
Nature Communications 1

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