Articles | Volume 30, issue 20
https://doi.org/10.5194/hess-30-6359-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-30-6359-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Basin-scale evaluation of the Noah-MP land surface model for runoff and snow generation in the Missouri River Basin: insights and recommendations for parameterization scheme selection
Eunsaem Cho
Hydrological Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, USA
Ingram School of Engineering, Texas State University, San Marcos, TX, USA
Carrie Vuyovich
Hydrological Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
Bailing Li
Hydrological Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, USA
Jennifer M. Jacobs
Department of Civil and Environmental Engineering, University of New Hampshire, Durham, NH, USA
Earth Systems Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH, USA
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Minsun Kang, Adam Hunsaker, Mahsa Moradi, Dan R. Glaser, and Jennifer M. Jacobs
EGUsphere, https://doi.org/10.5194/egusphere-2026-3105, https://doi.org/10.5194/egusphere-2026-3105, 2026
This preprint is open for discussion and under review for Hydrology and Earth System Sciences (HESS).
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Seasonal snow is a key water source, yet its amount and timing are hard to estimate in shallow, wet regions. Using a drone with ground-penetrating radar and laser scanner, alongside field measurements in New Hampshire, we tracked snow depth, density, and wetness. The snow shifted rapidly from dry to wet, and a physically based mixing model best matched the radar response. These observations help study spatially variable snowpacks and melt transitions that challenge field and remote sensing data.
Farhaan Cooverji, Eunsang Cho, Bailing Li, Carrie Vuyovich, Jennifer M. Jacobs, Eunsaem Cho, Eric A. Sproles, and Samuel E. Tuttle
EGUsphere, https://doi.org/10.5194/egusphere-2026-4186, https://doi.org/10.5194/egusphere-2026-4186, 2026
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Quantifying how much snowmelt feeds mountain rivers is hard. In a Missouri Headwater watershed, we estimated the region's water cycle, focusing on snowmelt generation. Well-validated hydrological data were more accurate individually, but the land surface model better balanced the annual water budget. It also underestimates evaporation and sublimation, inflating runoff estimates. This approach shows snowmelt supplies only about 32 % of runoff, well below earlier estimates near 65 %.
Justin Matthew Pflug, Kehan Yang, Nicoleta Cristea, Emma T. Boudreau, Carrie M. Vuyovich, and Sujay V. Kumar
EGUsphere, https://doi.org/10.5194/egusphere-2026-4850, https://doi.org/10.5194/egusphere-2026-4850, 2026
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Fine scale snow cover is important for hydrological and ecological applications. We test whether commercial satellite imagery can downscale 3 m snow cover from free, coarse-resolution snow cover observations. While machine learning estimates work best, combining 30 m snow cover estimates from Landsat and Sentinel with information about the terrain can also achieve high accuracies. These results can inform the most data and cost-effective approaches for tracking snow cover in montane regions.
Siddharth Singh, Carrie Vuyovich, and Ana P. Barros
EGUsphere, https://doi.org/10.5194/egusphere-2026-3588, https://doi.org/10.5194/egusphere-2026-3588, 2026
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Forests make it difficult to measure how much water is stored in snow because trees block and scatter signals from aircraft and satellites. This study combines weather-driven snow modeling with airborne radar observations to estimate snow depth and water stored in forested snowpacks. Results compared well with field and airborne measurements, showing that this approach can improve snow monitoring in forested regions important for water supply and flood forecasting.
Caleb G. Pan, Jeremy Johnston, Jennifer M. Jacobs, and Shad O'Neel
The Cryosphere, 20, 3759–3781, https://doi.org/10.5194/tc-20-3759-2026, https://doi.org/10.5194/tc-20-3759-2026, 2026
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We developed a simple method to turn a few airborne snow-mapping flights and one daily snow record into continuous maps showing how snow depth changes each day. Tested in Idaho and New Hampshire, the approach works well in both deep and shallow snow regions and helps plan when and how often to fly lidar surveys for the best results.
Jipeng Liu, Eunsang Cho, and Carrie M. Vuyovich
EGUsphere, https://doi.org/10.5194/egusphere-2026-986, https://doi.org/10.5194/egusphere-2026-986, 2026
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We analyzed airborne LiDAR data from NASA’s SnowEx 2023 campaign to study snow depth in Alaska’s boreal forests. Comparing LiDAR to ground measurements, we found it captures general snow patterns well, though tall trees and slopes reduce accuracy. This approach can help improve snow surveys and better manage water resources in remote forested areas.
Kajsa Holland-Goon, Randall Bonnell, Daniel McGrath, W. Brad Baxter, Tate Meehan, Ryan Webb, Christopher F. Larsen, Hans-Peter Marshall, Megan Mason, and Carrie Vuyovich
The Cryosphere, 20, 2169–2179, https://doi.org/10.5194/tc-20-2169-2026, https://doi.org/10.5194/tc-20-2169-2026, 2026
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As part of the NASA SnowEx23 campaign, we conducted detailed snowpack experiments in Alaska's boreal forests and Arctic tundra. We collected ground-penetrating radar measurements of snow depth along 44 short transects. We then excavated the snowpack from below the transects and measured snow depth, noting any vegetation and void spaces. We used the detailed in situ measurements to evaluate uncertainties in ground-penetrating radar and airborne lidar methods for snow depth retrieval.
Bailing Li, Abheera Hazra, Amy McNally, Kimberly Slinski, Shraddhanand Shukla, and Weston Anderson
Hydrol. Earth Syst. Sci., 30, 1097–1115, https://doi.org/10.5194/hess-30-1097-2026, https://doi.org/10.5194/hess-30-1097-2026, 2026
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Accurate prediction of terrestrial water storage (TWS) changes is essential for disaster response. This study evaluates TWS forecast skill over Africa using observations from the Gravity Recovery and Climate Experiment (GRACE). Results show that the NASA Catchment Land Surface Model (CLSM) outperforms Noah with Multi-Parameterization (Noah-MP) across 1-6 months lead times, owing to more accurate reanalysis-based initial conditions and stronger representation of TWS interannual variability.
Zachary Fair, Carrie Vuyovich, Thomas Neumann, Justin Pflug, David Shean, Ellyn M. Enderlin, Karina Zikan, Hannah Besso, Jessica Lundquist, Cesar Deschamps-Berger, and Désirée Treichler
The Cryosphere, 19, 5671–5691, https://doi.org/10.5194/tc-19-5671-2025, https://doi.org/10.5194/tc-19-5671-2025, 2025
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Lidar is commonly used to measure snow over global water reservoirs. However, ground-based and airborne lidar surveys are expensive, so satellite-based methods are needed. In this review, we outline the latest research using satellite-based lidar to monitor snow. Best practices for lidar-based snow monitoring are given, as is a discussion on challenges in this field of research.
Mahsa Moradi, Andrew G. Fleming, Adam Hunsaker, and Jennifer M. Jacobs
EGUsphere, https://doi.org/10.5194/egusphere-2025-4371, https://doi.org/10.5194/egusphere-2025-4371, 2025
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Images from Unoccupied aerial systems (UAS) allow us to map snow more accurately, especially where snow is shallow and does not last long. We used UAS with visible imagery and tested different methods of mapping snow (including a few machine learning methods) in open areas in southern New Hampshire, USA. We found that using the full color information gives the most reliable results. We showed how UAS surveys can be planned to create accurate snow maps, helping track snow in changing conditions.
Eunsang Cho, Megan Verfaillie, Jennifer M. Jacobs, Adam G. Hunsaker, Franklin B. Sullivan, Michael Palace, and Cameron Wagner
Hydrol. Earth Syst. Sci., 29, 4539–4556, https://doi.org/10.5194/hess-29-4539-2025, https://doi.org/10.5194/hess-29-4539-2025, 2025
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Unpiloted aerial system (UAS) lidar and structure-from-motion (SfM) photogrammetry effectively map high-resolution snow depths. Our study found that UAS lidar outperformed SfM, particularly in capturing stable snow distribution patterns. Vegetation type was the primary factor influencing snow depth across forest and field areas, reflecting soil variables, such as organic matter. When analyzed separately, slope and forest canopy shadowing played key roles.
Edward H. Bair, Dar A. Roberts, David R. Thompson, Philip G. Brodrick, Brenton A. Wilder, Niklas Bohn, Christopher J. Crawford, Nimrod Carmon, Carrie M. Vuyovich, and Jeff Dozier
The Cryosphere, 19, 2315–2320, https://doi.org/10.5194/tc-19-2315-2025, https://doi.org/10.5194/tc-19-2315-2025, 2025
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Key to the success of future satellite missions is understanding snowmelt in our warming climate, as this has implications for nearly 2 billion people. An obstacle is that an artifact, called the hook, is often mistaken for soot or dust. Instead, it is caused by three amplifying effects: (1) background reflectance that is too dark, (2) an assumption of level terrain, and (3) differences in optical constants of ice. Sensor calibration and directional effects may also contribute. Solutions are presented.
Colleen Mortimer, Lawrence Mudryk, Eunsang Cho, Chris Derksen, Mike Brady, and Carrie Vuyovich
The Cryosphere, 18, 5619–5639, https://doi.org/10.5194/tc-18-5619-2024, https://doi.org/10.5194/tc-18-5619-2024, 2024
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Ground measurements of snow water equivalent (SWE) are vital for understanding the accuracy of large-scale estimates from satellites and climate models. We compare two types of measurements – snow courses and airborne gamma SWE estimates – and analyze how measurement type impacts the accuracy assessment of gridded SWE products. We use this analysis to produce a combined reference SWE dataset for North America, applicable for future gridded SWE product evaluations and other applications.
Justin M. Pflug, Melissa L. Wrzesien, Sujay V. Kumar, Eunsang Cho, Kristi R. Arsenault, Paul R. Houser, and Carrie M. Vuyovich
Hydrol. Earth Syst. Sci., 28, 631–648, https://doi.org/10.5194/hess-28-631-2024, https://doi.org/10.5194/hess-28-631-2024, 2024
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Estimates of 250 m of snow water equivalent in the western USA and Canada are improved by assimilating observations representative of a snow-focused satellite mission with a land surface model. Here, by including a gap-filling strategy, snow estimates could be improved in forested regions where remote sensing is challenging. This approach improved estimates of winter maximum snow water volume to within 4 %, on average, with persistent improvements to both spring snow and runoff in many regions.
Zachary Hoppinen, Shadi Oveisgharan, Hans-Peter Marshall, Ross Mower, Kelly Elder, and Carrie Vuyovich
The Cryosphere, 18, 575–592, https://doi.org/10.5194/tc-18-575-2024, https://doi.org/10.5194/tc-18-575-2024, 2024
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We used changes in radar echo travel time from multiple airborne flights to estimate changes in snow depths across Idaho for two winters. We compared our radar-derived retrievals to snow pits, weather stations, and a 100 m resolution numerical snow model. We had a strong Pearson correlation and root mean squared error of 10 cm relative to in situ measurements. Our retrievals also correlated well with our model, especially in regions of dry snow and low tree coverage.
Eunsang Cho, Yonghwan Kwon, Sujay V. Kumar, and Carrie M. Vuyovich
Hydrol. Earth Syst. Sci., 27, 4039–4056, https://doi.org/10.5194/hess-27-4039-2023, https://doi.org/10.5194/hess-27-4039-2023, 2023
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An airborne gamma-ray remote-sensing technique provides reliable snow water equivalent (SWE) in a forested area where remote-sensing techniques (e.g., passive microwave) typically have large uncertainties. Here, we explore the utility of assimilating the gamma snow data into a land surface model to improve the modeled SWE estimates in the northeastern US. Results provide new insights into utilizing the gamma SWE data for enhanced land surface model simulations in forested environments.
Eunsang Cho, Carrie M. Vuyovich, Sujay V. Kumar, Melissa L. Wrzesien, and Rhae Sung Kim
The Cryosphere, 17, 3915–3931, https://doi.org/10.5194/tc-17-3915-2023, https://doi.org/10.5194/tc-17-3915-2023, 2023
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As a future snow mission concept, active microwave sensors have the potential to measure snow water equivalent (SWE) in deep snowpack and forested environments. We used a modeling and data assimilation approach (a so-called observing system simulation experiment) to quantify the usefulness of active microwave-based SWE retrievals over western Colorado. We found that active microwave sensors with a mature retrieval algorithm can improve SWE simulations by about 20 % in the mountainous domain.
Holly Proulx, Jennifer M. Jacobs, Elizabeth A. Burakowski, Eunsang Cho, Adam G. Hunsaker, Franklin B. Sullivan, Michael Palace, and Cameron Wagner
The Cryosphere, 17, 3435–3442, https://doi.org/10.5194/tc-17-3435-2023, https://doi.org/10.5194/tc-17-3435-2023, 2023
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This study compares snow depth measurements from two manual instruments in a field and forest. Snow depths measured using a magnaprobe were typically 1 to 3 cm deeper than those measured using a snow tube. These differences were greater in the forest than in the field.
Eunsang Cho, Carrie M. Vuyovich, Sujay V. Kumar, Melissa L. Wrzesien, Rhae Sung Kim, and Jennifer M. Jacobs
Hydrol. Earth Syst. Sci., 26, 5721–5735, https://doi.org/10.5194/hess-26-5721-2022, https://doi.org/10.5194/hess-26-5721-2022, 2022
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While land surface models are a common approach for estimating macroscale snow water equivalent (SWE), the SWE accuracy is often limited by uncertainties in model physics and forcing inputs. In this study, we found large underestimations of modeled SWE compared to observations. Precipitation forcings and melting physics limitations dominantly contribute to the SWE underestimations. Results provide insights into prioritizing strategies to improve the SWE simulations for hydrologic applications.
Leung Tsang, Michael Durand, Chris Derksen, Ana P. Barros, Do-Hyuk Kang, Hans Lievens, Hans-Peter Marshall, Jiyue Zhu, Joel Johnson, Joshua King, Juha Lemmetyinen, Melody Sandells, Nick Rutter, Paul Siqueira, Anne Nolin, Batu Osmanoglu, Carrie Vuyovich, Edward Kim, Drew Taylor, Ioanna Merkouriadi, Ludovic Brucker, Mahdi Navari, Marie Dumont, Richard Kelly, Rhae Sung Kim, Tien-Hao Liao, Firoz Borah, and Xiaolan Xu
The Cryosphere, 16, 3531–3573, https://doi.org/10.5194/tc-16-3531-2022, https://doi.org/10.5194/tc-16-3531-2022, 2022
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Snow water equivalent (SWE) is of fundamental importance to water, energy, and geochemical cycles but is poorly observed globally. Synthetic aperture radar (SAR) measurements at X- and Ku-band can address this gap. This review serves to inform the broad snow research, monitoring, and application communities about the progress made in recent decades to move towards a new satellite mission capable of addressing the needs of the geoscience researchers and users.
Holly Proulx, Jennifer M. Jacobs, Elizabeth A. Burakowski, Eunsang Cho, Adam G. Hunsaker, Franklin B. Sullivan, Michael Palace, and Cameron Wagner
The Cryosphere Discuss., https://doi.org/10.5194/tc-2022-7, https://doi.org/10.5194/tc-2022-7, 2022
Manuscript not accepted for further review
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This study compares snow depth measurements from two manual instruments and an airborne platform in a field and forest. The manual instruments’ snow depths differed by 1 to 3 cm. The airborne measurements , which do not penetrate the leaf litter, were consistently shallower than either manual instrument. When combining airborne snow depth maps with manual density measurements, corrections may be required to create unbiased maps of snow properties.
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Short summary
This study evaluated how alternative parameterization schemes in the Noah-Multiparameterization model affect snow and runoff in the Missouri River Basin. Simulations were compared with U.S. Geological Survey streamflow, University of Arizona snow water equivalent, and Global Land Evaporation Amsterdam Model evapotranspiration across 50 Hydro-Climate Data Network subbasins. As a result, we confirmed alternative schemes could improve groundwater, evapotranspiration, and runoff representation.
This study evaluated how alternative parameterization schemes in the Noah-Multiparameterization...