Lipid Biomarker Record Documents Hydroclimatic Variability of the Mississippi River Basin During the Common Era

Muñoz, Samuel E.; Porter, Trevor J.; Bakkelund, Aleesha; Nusbaumer, Jesse; Dee, Sylvia G.; Hamilton, Brynnydd; Giosan, Liviu; Tierney, Jessica E.

doi:10.1029/2020GL087237

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Lipid Biomarker Record Documents Hydroclimatic Variability of the Mississippi River Basin During the Common Era

2020
By Muñoz, Samuel E. ; Porter, Trevor J. ; Bakkelund, Aleesha ; ...
Source: Geophysical Research Letters 47(12): e2020GL087237

[PDF-3.68 MB]

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Details:

Journal Title:

Geophysical Research Letters
Personal Author:

Muñoz, Samuel E. ; Porter, Trevor J. ; Bakkelund, Aleesha ; Nusbaumer, Jesse ; Dee, Sylvia G. ; ... More +

Muñoz, Samuel E. ; Porter, Trevor J. ; Bakkelund, Aleesha ; Nusbaumer, Jesse ; Dee, Sylvia G. ; Hamilton, Brynnydd ; Giosan, Liviu ; Tierney, Jessica E. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office)

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) Less -
Description:

Floods and droughts in the Mississippi River basin are perennial hazards that cause severe economic disruption. Here we develop and analyze a new lipid biomarker record from Horseshoe Lake (Illinois, USA) to evaluate the climatic conditions associated with hydroclimatic extremes that occurred in this region over the last 1,800 years. We present geochemical proxy evidence of temperature and moisture variability using branched glycerol dialkyl glycerol tetraethers (brGDGTs) and plant leaf wax hydrogen isotopic composition (δ2Hwax) and use isotope-enabled coupled model simulations to diagnose the controls on these proxies. Our data show pronounced warming during the Medieval era (CE 1000–1,600) that corresponds to midcontinental megadroughts. Severe floods on the upper Mississippi River basin also occurred during the Medieval era and correspond to periods of enhanced warm-season moisture. Our findings imply that projected increases in temperature and warm-season precipitation could enhance both drought and flood hazards in this economically vital region.
Keywords:

[+]

Climatology Hydrology Paleoclimatology Hydroclimate
Source:

Geophysical Research Letters 47(12): e2020GL087237
DOI:

https://doi.org/10.1029/2020GL087237
Document Type:

Journal Article
Funding:

Grant no. NA18OAR4310427
Place as Subject:

Mississippi River Watershed
Rights Information:

CC BY
Compliance:

Submitted
Main Document Checksum:

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urn:sha256:ced6f50bc8c4bf182ccc9a26823f727affcdae17949040f0c4406e52968ff62b
Download URL:

https://repository.library.noaa.gov/view/noaa/44709/noaa_44709_DS1.pdf
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