class: inverse <img src="data:image/png;base64,#tibet-background.jpg" style="position: absolute; top: 0px; left: 0px; height: 100%"/> .big-right[ ## .center[Climate history of the Tibetan Plateau ] ### .center[A joint exploration with students] <br> .center[ Hung Nguyen Lamont-Doherty Earth Observatory Columbia University ] ] --- # Trees are natural archives of the past <img src="data:image/png;base64,#tree-rings-dg.jpg" style="width: 100%"/> .left-footnote[Image: Daniel Griffin] --- # Why was Angkor abandoned? .small-left[ <img src="data:image/png;base64,#sea-map-900.svg" style="width: 85%"/> **Map of Southeast Asia in 900 CE.** .small[Source: Wikipedia] ] .big-right[ ![](data:image/png;base64,#angkor-wat.jpg) <a href="https://commons.wikimedia.org/wiki/File:Angkor_Wat_reflejado_en_un_estanque_07.jpg">LBM1948</a>, <a href="https://creativecommons.org/licenses/by-sa/4.0">CC BY-SA 4.0</a>, via Wikimedia Commons <br> .steelblue.large[Angkor was dubbed a "hydraulic city", one of the biggest population centers at the time.] .firebrick.large[**Was climate a factor?**] ] --- # Tree rings reveal climate as a contributing factor .center[<img src="data:image/png;base64,#angkor-droughts.png" style="width: 90%" />] Buckley et al. (2010, 2014), Cook et al. (2010) .large[Data: .steelblue[**Monsoon Asia Drought Atlas (MADA)**]] --- class: center, middle, inverse # History in .steelblue[natural] and .darkorange[written] archives --- ## How can historians and climate scientists join forces? -- .pull-left[ .content-box-blue.huge[Through conversations] <br> .center[<img src="data:image/png;base64,#conversation.svg" style="width:50%" />] ] -- .pull-right[ .content-box-purple.huge[Let's do it with our students] <br> .center[<img src="data:image/png;base64,#classroom.svg" style="width: 50%" />] <br> Kudos: Gray Tuttle, Lauran Hartley, Palden Gyal ] --- <img src="data:image/png;base64,#new-course.png" style="width: 60%"/> -- .mid-right.firebrick.huge[How to teach<br>climate data analytics<br>to history students?] --- # Students modify existing code for new results .pull-left[ ```r *DT <- mada[time %between% c(1756, 1768), .(pdsi = mean(pdsi)), by = .(lon, lat)] ggplot(DT) + geom_raster(aes(lon, lat, fill = pdsi)) + geom_polygon(aes(long, lat, group = group), map_data('world'), fill = NA, color = 'gray') + scale_x_continuous(expand = c(0, 0), labels = paste_long) + scale_y_continuous(expand = c(0, 0), labels = paste_lat) + labs(x = NULL, y = NULL) + scale_fill_distiller(palette = 'RdBu', limits = abs_range(DT$pdsi), direction = 1) + coord_quickmap(xlim = xrange, ylim = yrange) + panel_border('black', 0.2) + theme(legend.position = 'top', legend.key.width = unit(1.5, 'cm')) ``` ] .pull-right[ <img src="data:image/png;base64,#Tibet-panel_files/figure-html/mada1750-out-1.png" width="468" /> ] --- # Students modify existing code for new results .pull-left[ ```r *DT <- mada[time %between% c(1070, 1200), .(pdsi = mean(pdsi)), by = .(lon, lat)] ggplot(DT) + geom_raster(aes(lon, lat, fill = pdsi)) + geom_polygon(aes(long, lat, group = group), map_data('world'), fill = NA, color = 'gray') + scale_x_continuous(expand = c(0, 0), labels = paste_long) + scale_y_continuous(expand = c(0, 0), labels = paste_lat) + labs(x = NULL, y = NULL) + scale_fill_distiller(palette = 'RdBu', limits = abs_range(DT$pdsi), direction = 1) + coord_quickmap(xlim = xrange, ylim = yrange) + panel_border('black', 0.2) + theme(legend.position = 'top', legend.key.width = unit(1.5, 'cm')) ``` ] .pull-right[ <img src="data:image/png;base64,#Tibet-panel_files/figure-html/mada1500-out-1.png" width="468" /> ] --- # Playground: MADA Explorer <br> .huge[https://ntthung.shinyapps.io/MADA-Explorer/] --- class: center, middle, inverse # Some findings --- # Monastery data Credit: Yumtsokyi Bhum
--- # Monastery establishment over time <img src="data:image/png;base64,#Tibet-panel_files/figure-html/unnamed-chunk-3-1.png" width="864" /> --- ## 1040–1070 climate .center[ <img src="data:image/png;base64,#Tibet-panel_files/figure-html/unnamed-chunk-4-1.png" width="576" /> ] --- # What's next? .pull-left[ - Final presentations: April 27 - Summer readings - Paleoclimate data + GIS + historical documents = new insights - Proposal to NSF Human Environment and Geographical Sciences ] -- .pull-right[ <img src="data:image/png;base64,#lhasa-stripe.png" /> ] -- .contact[ <img src="data:image/png;base64,#home-solid.svg" height="16px" style="vertical-align:middle"/> [ntthung.github.io](https://ntthung.github.io) <img src="data:image/png;base64,#email.svg" height="16px" style="vertical-align:middle"/> [hnguyen@ldeo.columbia.edu](mailto:hnguyen@ldeo.columbia.edu) <img src="data:image/png;base64,#twitter.svg" height="16px" style="vertical-align:middle"/> [@Hung_TT_Nguyen](https://twitter.com/Hung_TT_Nguyen) ]