💧🌏 Greg CocksJan 29
See The Mississippi River’s Hidden History, Uncovered By Lasers
Using hyperprecise LiDAR data,. a cartographer [well, hydrographer!] maps the river’s bend and channels over time with mesmerizing results…
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https://www.nationalgeographic.com/science/article/mississippi-rivers-hidden-history-uncovered-by-lidar <-- shared technical / media article
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https://dancoecarto.com/ <-- shared @Daniel Coe portfolio and more
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https://usace.contentdm.oclc.org/digital/collection/p266001coll1/id/10015/ <-- shared Harold Fisk's 1944 USACE report, “The Alluvial Valley of the Lower Mississippi River”
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#GIS #spatial #mapping #water #hydrography #hydrology #LiDAR #remotesensing #spatialanalysis #spatiotemporal #hydrogeomorphology #Mississippi #River #Fiske #cartography #visualisation #meandering #channels #landforms #floodplains #opendata #3DEP #topography #geomorphology #levees #dikes #oxbows #channel #paleohydrology
#DanielCoe | @nationalgeographic | #USGS | #USACE
💧🌏 Greg CocksApr 8, 2025
Ancient Lakes And Rivers Unearthed In Arabia's Vast Desert
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https://phys.org/news/2025-04-ancient-lakes-rivers-unearthed-arabia.html <-- shared technical article
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https://doi.org/10.1038/s43247-025-02224-1 <-- shared paper
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#GIS #spatial #mapping #water #hydrology #quaternary #desert #geomorphology #landforms #geomorphometry #Arabia #climatechange #RubalKhali #SaudiArabia #holocene #model #modeling #spatialanalysis #spatiotemporal #earthsystemmodel #geology #lacustrine #fluvial #sediments #sedimentary #flood #flooding #lakes #AfricanMonsoon #rivers #paleohydrology #stratigraphy #remotesensing #landsat #earthobservation #dating #delta #cliff #terrace #rainfall #precipitation
Ancient lakes and rivers unearthed in Arabia's vast desert

The desert that we see today in Arabia was once a region that repeatedly underwent "green" periods in the past, as a result of periods of high rainfall, resulting in the formation of lakes and rivers about 9,000 years ago.

Nina DavtianFeb 11, 2025

On this #InternationalDayOfWomenAndGirlsInScience, here is a great story presented in two papers led by a #WomanInScience (Jingjing Guo) and last authored by another #WomanInScience (Francien Peterse).

#Scientific #publication #1: https://doi.org/10.5194/cp-21-343-2025
Scientific publication #2: https://doi.org/10.1016/j.orggeochem.2025.104947

#Science
#ScienceMastodon
#AcademicMastodon
#PaleoClimate
#PaleoHydrology
#EastAsianMonsoon
#PaleoTemperature
#OrganicGeochemistry
#GDGTs #brGDGTs
#ClimateProxies #Loess
#IDWGS #IDWGS2025

Towards quantitative reconstruction of past monsoon precipitation based on tetraether membrane lipids in Chinese loess

Abstract. Variations in the oxygen isotope composition (δ18O) of cave speleothems and numerous proxy records from loess–paleosol sequences have revealed past variations in East Asian monsoon (EAM) intensity. However, challenges persist in reconstructing precipitation changes quantitatively. Here, we use the positive relationship between the degree of cyclization (DC) of branched glycerol dialkyl glycerol tetraethers (brGDGTs) in modern surface soils from the Chinese Loess Plateau (CLP) and mean annual precipitation (MAP) to quantify past monsoon precipitation changes on the CLP. We present a new ∼ 130 000-year-long DC-based MAP record for the Yuanbao section on the western edge of the CLP, which closely tracks the orbital- and millennial-scale variations in available records of both speleothem δ18O and the hydrogen isotope composition of plant waxes (δ2Hwax) from the same section. Combing our new data with existing brGDGT records from other CLP sites reveals a spatial gradient in MAP that is most pronounced during glacials, when the western CLP experiences more arid conditions and receives up to ∼ 250 mm less precipitation than in the southeast, whereas MAP is ∼ 850 mm across the CLP during the Holocene optimum. Furthermore, the DC records show that precipitation amount on the CLP varies at both the precession scale and the obliquity scale, as opposed to the primarily precession-scale variations in speleothem δ18O and δ2Hwax at Yuanbao and the 100 kyr cycle in other loess proxies, such as magnetic susceptibility, which rather indicates the relative intensity of the EAM. At the precession scale, the DC record is in phase with δ2Hwax from the same section and the speleothem δ18O record, which supports the hypothesis that monsoon precipitation is driven by Northern Hemisphere summer insolation.

Nina DavtianOct 25, 2024
I am honored to co-author the new #scientific #publication first-authored by Petter Hällberg! This time, it is the use of #levoglucosan rather than #GDGTs—as #paleohydrology rather than #paleotemperature #ClimateProxies this time!—which granted me this #collaboration and co-authorship!
https://doi.org/10.1016/j.quascirev.2024.108948
More information in the following thread: 👇🏻 (1/6)
#Science
#ScienceMastodon #AcademicMastodon
#Paper #OpenAccess #OpenAccessWeek #OpenAccessWeek24 #OpenAccessWeek2024
#isoGDGTs #brGDGTs
Disentangling seasonal and annual precipitation signals in the tropics over the Holocene: Insights from δD, alkanes and GDGTs

Rainfall seasonality in the tropics has a substantial impact on both ecosystems and human livelihoods. Yet, reconstructions of past rainfall variabili…

Brian WadeJun 4, 2024

Onset of the Earth’s hydrological cycle four billion years ago or earlier
#hydrology #paleohydrology #science

https://www.nature.com/articles/s41561-024-01450-0

Onset of the Earth’s hydrological cycle four billion years ago or earlier - Nature Geoscience

Oxygen isotopic evidence from Jack Hill zircon crystals suggests that meteoric (fresh) water interacted with crustal magma systems four billion years ago, meaning that the hydrological cycle began at or before this time.

Nature
💧🌏 Greg CocksMay 16, 2024
The Egyptian Pyramid Chain Was Built Along The Now-Abandoned Ahramat Nile Branch
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https://doi.org/10.1038/s43247-024-01379-7 <-- shared paper
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#GIS #spatial #mapping #Egypt #pyramid #pyramids #Nile #NileR #NileRiver #water #hydrology #archaeology #AncientEgypt #desert #meander #branch #radar #satellite #remotesensing #earthobservation #EO #geophysics #GPR #sampling #soil #coring #subsurface #sedimentology #NileValley #Ahramat #AhramatBranch #WesternDesertPlateau #OldKingdom #MiddleKingdom #causeways #ValleyTemples #harbours #construction #engineering #transportation #river #buildingmaterials #paleohydrology
💧🌏 Greg CocksFeb 28, 2024
A 350,000-Year History Of Groundwater Recharge In The Southern Great Basin, USA
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https://doi.org/10.1038/s43247-023-00762-0 <-- shared paper
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#GIS #spatial #mapping #groundwater #water #hydrology #waterresources #recharge #infiltration #GreatBasin #Nevada #model #modeling #USA #watertable #glacial #interglacial #climate #climatechange #paleohydrology #paleowater #devilshole
Dr. Josh BregyDec 12, 2022
Come check out #AGU22 session on extreme events in the paleorecord! We’re talking #prehistoric #hurricanes & #floods Tuesday afternoon & all day on Wednesday! This is a session that I’m proud to have organized & I hope it will be an #AGU regular. We love #paleohazards & hope you’ll join us as we discuss the latest research in the field! #paleotempestology #paleoclimatology #paleohydrology #hazards #extremeevents #tropicalcyclones #water #geoscience