Hwa-Jin Choi

Why we are interested in river discharge into the Arctic? The future phytoplankton change influenced by greenhouse warming can amplify Arctic surface warming considerably(Park et al., 2015). Freshwater inflow into the Arctic Ocean is important to the thermohaline circulation of the world’s oceans, Arctic Ocean circulation, salinity, sea ice dynamics, and biomass of phytoplankton. Shrinking Beauf..

Chlorophyll concentration comparison – TOPAZ and MODIS Chlorophyll concentration comparison – TOPAZ and BEC CESM BEC(Biogeochemical Elemental Cycling) model The Community Earth System Model (CESM) is a fully-coupled, global climate model. (composed of separate models simultaneously simulating atmosphere, ocean, land, land-ice, and sea-ice.) The BEC model is an ecosystem and biogeochemical module..

Long-term trends ALL : P and E show a slight decrease in the 1960-1970s due to the cooling effect of anthropogenic aerosol and, subsequently a strong increase. GHG : P, E, and F (P-E) monotonically increase. AER : P and E exhibit a decrease until the 1990s and then slightly increase (Tokarska et al., 2020), reflecting changes in aerosol forcing during this period. Spatial pattern of long-term tr..

Data CMIP6 individual forcing simulations ALL (historical + ssp2-4.5) : Natural & anthropogenic forcing GHG (hist-GHG) : Greenhouse gases forcing only NAT (hist-nat) : Natural forcing AER (hist-aer) : Aerosol forcing Moisture budget analysis Vertically integrated meridional moisture flux Analysis Period 1960-2019 1960-2019 Frequency Monthly Daily Vertical Level Surface 1000, 850, 700,500,250 (hP..

Important impacts of intensified Arctic atmospheric water cycle Changes in the Arctic freshwater system are likely to have a range of effects. P – E changes have direct impacts on the salinity of the Arctic Ocean, which is a critical factor in determining ocean convection, affecting the Atlantic Meridional Overturning Circulation (AMOC). Changes in the Arctic freshwater system influence the terr..

Results Metabolic Index prediction skill The predictive skill of the metabolic index shows significant skill in many ocean regions in one year advance. The skillful prediction of the metabolic index extends to a 2-year lead time across many global oceans, particularly within the subsurface layers. Nevertheless, the predictive skill is generally reduced compared to that of a 1-year lead time. The..

Introduction Impacts of climate change on marine ecosystems Marine ecosystems have been facing unprecedented climate change as rising temperatures, declines in dissolved O2, and rapid ocean acidification. Climate change has caused shifts in the abundance, geographic distribution, and phenology of marine species. Importance of dissolved oxygen in marine ecosystems https://sitn.hms.harvard.edu/fla..

Serious error I met two significant errors for running the model, which is the instability error and the “p4zopt.f90 ” crash issue. Try 1) nn_date0=20120101, rn_rdt = 3600s, boundary forcing ⇒ monthly, Crashed due to grid resolution on April 16th Try 2) 20120101, 3600s until March ⇒ From April 1st 2400s ⇒ Crashed on April 8th Try 3) when 1800s, Crashed on April 10th ⇒ Resolution is too small, er..

Boundary data needed I used JRA55 for running the experiments. The contents below are the names and information of the JRA data used. JRA55 anl_surf125 spfh : Specific humidity (6 hours) vgrd : v-component of wind (6 hours) ugrd : u-component of wind (6 hours) tmp : 2m Temperature (6 hours) prmsl : mean sea level (6 hours) fcst_phy2m125 tprat : Total precipitation (monthly) dlwrf : Downward long..

I had a hard time running the NEMO model on my own. But thanks to good websites, I was able to run the model successfully. For those of you who need these websites, I am sharing a list of good websites. Basic Manuals NEMO Ocean Engine Reference Manual Gurvan Madec, Mike Bell, Adam Blaker, Clément Bricaud, Diego Bruciaferri, Miguel Castrillo, Daley Calvert, Jérômeme Chanut, Emanuela Clementi, And..