https://www.bradleymarkle.com/home daily 1.0 2020-12-15 https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573202433718-HZB0F2C7YUSC7AF4DHBZ/ice.jpg Home - Research My interests are in Paleoclimate and Climate Dynamics, particularly in the high latitudes. I use geochemical proxy records and models to understand what the Earth’s climate looked like in the past and the mechanisms by which it works. https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1572294186101-OQBIIFC0VKONXG7VH7XD/JIRP_2017_C18_Ben_Huff-236.jpg Home - Welcome! I’m Bradley Markle. I’m an Assistant Professor at the Institute for Arctic and Alpine Research (INSTAAR) and the Department of Geological Sciences at the University of Colorado, Boulder. I’m a scientist interested in the Earth’s climate system, how it works and how it changes through time. The goals of this website are two-fold: A place to put some research. A place to put some photography. https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573415162259-T4T170NWCOVX7FODJ2OG/P8291215+-+Version+2.jpg Home - Photography I’ve been very lucky to go to some very pretty places. https://www.bradleymarkle.com/research daily 0.75 2020-08-28 https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573255078316-8GR59I1V571T41HKFXTD/bottom_of_mt_hunter_ice_core.JPG Research https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573278966607-J0A0CJ9OZ2ZUWQVZE5IE/P2120038.jpg Research https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573277121420-JXBI8U0Z7XRARK0S9FXB/P1063271.JPG Research https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573245983647-KQ0Z0FO0WB2EQIK14Z58/Screen+Shot+2019-11-08+at+12.45.44+PM.png Research - What controls dust in the high latitudes? The amount of dust landing on the polar ice sheets changed by orders of magnitude over glacial cycles. Why? It has long been thought that changes in aerosol source strength are the primary driver. I don’t think that is right. I think changes in the hydrological cycle dominate variability in dust, and other aerosols like sea salt, over a range of time scales. https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573246072566-IDYXOEYZS78WFVIHYDSH/Screen+Shot+2019-11-08+at+12.47.38+PM.png Research - Atmospheric teleconnections during DO events. A series of abrupt Northern Hemisphere warming events punctuated the climate of the last glacial period. By reinterpreting the deuterium-excess water isotope parameter in Antarctic ice cores, I found evidence for shifts in the southern westerly winds, near synchronous with the abrupt warming events on the other side of the globe. Both atmospheric and oceanic teleconnections link the high and low latitudes during abrupt climate change in the past. In a subsequent, related study, lead by Christo Buizert, we showed that these wind-driven changes can be seen all around Antarctica. (This study showed a few other neat things too! You should read it.) https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1575674713552-8TV5XHQ7FN4TXNL3NT4N/nature_cover.jpg Research - What controls inter-annual to decadal variability in the high latitudes? This was an awesome study, lead by Tyler Jones at CU Boulder, that I was pleased to be a part of. Using a ridiculously high resolution water isotope record form WAIS Divide (sub annual for tens of thousands of years!) we investigate how inter-annual and decadal variability changes during the transition out of the last ice age. We find that all variability was something like 30% higher during the ice age, but that inter-annual variability (e.g. that associated with things like ENSO) was even stronger, doubled in fact! Why was this? Based on some GCM modeling, we think it was due to the presence of the Laurentide Ice Sheet in the opposite hemisphere, which alters the strength of the teleconnection between the tropics and the high-latitude Southern Hemisphere. I know, it’s wild! Plus my photo made the cover! https://www.bradleymarkle.com/pagecv daily 0.75 2024-03-25 https://www.bradleymarkle.com/teaching daily 0.75 2019-10-28 https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573242764583-4IRMBDKWCTB8PNEDOIRQ/JIRP+2018+JAA+_DSC8002+Jay.jpeg Teaching - Engaging students My primary goal in teaching is to help students understand and practice scientific thinking; to ask clear questions about the world and come up with ways to answer them. I think experiential, hands-on learning is critical for Earth science and try to engage students in active research projects. https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573255415052-CQY0N92TUE4QAS9EAH9R/P7303626.JPG Teaching - Juneau Icefield Research Program I am an Associate Director of the Juneau Icefield Research Program (JIRP), and a member its Academic Council and Faculty. We are an interdisciplinary summer school focusing on polar science. JIRP is an immersive experience and provides training in expeditionary research, glacier travel, field techniques, and fundamental science. Students participate in summer-long group research projects. I lead a project in climatology and isotope geochemistry. If you are an undergraduate student looking for a field school focusing in glaciology and climate science, you should apply! https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573257555322-BHNX2A4QG2XSUC1VPHSM/JIRP_2017_C18_Ben_Huff-252.jpeg Teaching https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573257513389-2DOJ4YHQI7Z26CNY0LVB/JIRP+2018+JAA+_DSC8004+Jay.jpeg Teaching https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573257543881-ZCZQK3N4L5IK62IB8JUJ/P8044898.JPG Teaching https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573257533206-XUQC56LUXL0CN3M581V7/DSCF0259.JPG Teaching https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573257559148-N84UHU14DQC3JSENVO9J/P7313654.JPG Teaching https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573257544688-3C4VLNR0B9DK7OK9RGQU/JIRP+2018+JAA+_DSC7611+Jay.jpeg Teaching https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573257562100-VHMSHWMX03JJ9S9YNM83/P8055238.JPG Teaching https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573257555403-PGXV4IOW8QX9KKRR0OXE/P7313660.JPG Teaching https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573261564883-CUFALNHU36T3WG8Y8UXG/P8045051.jpg Teaching https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573276367592-Q43VZ2R7SH0UVI0IRBGZ/DSC03684.JPG Teaching https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573276433845-DXLKXT52PL5VFLXB03JE/DSC03761.JPG Teaching https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573276462977-O2GT47KVZ1MQGKWBPF8Q/DSC03624.JPG Teaching https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573276469428-MOAPR6KDLCEDHQQ9RDSM/DSC03353.JPG Teaching https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573276405060-Y2J9ZR3QOXIPPFIOP1OR/DSC03716.JPG Teaching https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573276407952-SJM35TVLIUKZZ2U4QT8V/DSC03739.JPG Teaching https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573288703006-MH0IMKL5H6XU8X5TTKSF/ice_cave_juno_icefield.JPG Teaching https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573288882075-ZYR3T0SOPP9LO1UHGHF0/denali_base_camp.JPG Teaching https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573288902031-8IQ3BOHLTB21LQMCKEBY/P8055160.JPG Teaching https://www.bradleymarkle.com/publications daily 0.75 2024-07-04 https://www.bradleymarkle.com/contact daily 0.75 2024-03-25 https://www.bradleymarkle.com/about daily 0.75 2020-02-21 https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573252262223-LT8BWZKEIXQ99FPVBENO/65269982_10101474831941894_5408446479545139200_n.jpg About https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1574208751262-Q7UJ2XRM22T0UKT9T0AC/DSC_0529.jpg About https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1575599292664-XAS1YH7EXPORGQX38JZC/WAIS_picture.jpg About https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1574208622796-23TEKX055J77M97QB1D5/IMG_9379.JPG About https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1574138131195-SRYPGDYM4UIYP5OD86UX/IMG_0435.jpg About https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573253728182-O0R2UG8DF07R4YFGF3LU/P6111897_2.jpg About https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573253608270-D78NH3DUG826HUCJK7TH/IMG_0164+-+Version+2.jpg About https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573253811850-3EUL6I5RLDZCGX2Z6UOW/IMG_6566+-+Version+2.jpg About https://www.bradleymarkle.com/covid19 daily 0.75 2020-06-06 https://www.bradleymarkle.com/photography daily 0.75 2020-07-10 https://www.bradleymarkle.com/photography/the-antarctic-peninsula monthly 0.5 2019-12-01 https://images.squarespace-cdn.com/content/v1/5db5fafc78edb86950c78c30/1573333926869-FXQCJE75K9RX00SUL48G/P1061454.JPG Photography - 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