Limnol. Oceanogr., 59(2), 0000, 373–384
© 2014, by the Association for the Sciences of Limnology and Oceanography, Inc. 
Nutrient loading and meteorological conditions explain interannual variability of hypoxia in Chesapeake Bay
Yuntao Zhou, Donald Scavia, and Anna M. Michalak
Table A1. Median and 95% confidence intervals (CI) of estimated hypoxic volume (km3) from conditional realizations; na, periods for which dissolved oxygen measurements are not available.
    Early April   Late April   Early May   Late May   Early June   Late June   Early July   Late July   Early August   Late August   Early September   Late September   Early October   Late October
Year   Median 95% CI   Median 95% CI   Median 95% CI   Median 95% CI   Median 95% CI   Median 95% CI   Median 95% CI   Median 95% CI   Median 95% CI   Median 95% CI   Median 95% CI   Median 95% CI   Median 95% CI   Median 95% CI
1985 0.00 0.00–0.00 0.48 0.33–0.66 0.06 0.02–0.12 1.44 1.29–1.62 3.53 3.18–3.87 3.53 3.11–3.95 2.89 2.45–3.43 5.71 5.16–6.37 2.86 2.57–3.18 3.57 3.17–4.11 6.88 6.26–7.59 1.59 1.22–1.97 0.34 0.21–0.51 0.13 0.08–0.18
1986 0.00 0.00–0.00 0.01 0.00–0.04 0.28 0.16–0.42 1.21 0.96–1.50 2.97 2.46–3.52 2.99 2.72–3.27 6.12 4.17–9.22 11.05 10.23–11.88 7.90 7.35–8.50 1.99 1.77–2.20 2.74 2.38–3.13 0.76 0.59–0.93 1.20 0.99–1.42 0.00 0.00–0.00
1987 0.00 0.00–0.00 0.00 0.00–0.00 0.11 0.06–0.20 2.83 2.47–3.23 7.09 6.49–7.68 8.22 6.39–10.31 6.46 5.83–7.04 8.18 7.54–8.93 6.58 5.99–7.23 3.96 3.59–4.34 2.73 2.34–3.18 1.26 0.06–8.97 0.21 0.14–0.28 0.00 0.00–0.00
1988 0.00 0.00–0.00 0.00 0.00–0.00 0.07 0.03–0.14 2.74 2.43–3.05 4.18 3.83–4.49 4.59 4.15–5.06 2.47 2.20–2.76 6.66 6.11–7.21 8.17 7.48–8.89 4.04 3.71–4.39 1.96 1.81–2.13 2.56 2.30–2.84 2.18 1.98–2.41 0.01 0.00–0.03
1989 0.00 0.00–0.00 0.00 0.00–0.00 0.00 0.00–0.00 0.01 0.00–0.10 1.64 1.35–1.91 6.31 5.78–6.82 9.13 8.46–9.84 10.46 9.69–11.16 5.53 4.89–6.31 6.21 5.61–6.88 3.35 2.97–3.80 0.30 0.23–0.37 0.00 0.00–0.00 0.00 0.00–0.00
1990 0.00 0.00–0.01 0.01 0.00–0.02 3.22 2.94–3.49 4.12 3.82–4.41 1.58 1.29–1.88 4.52 4.02–5.04 na na 4.94 4.38–5.52 8.08 7.41–8.74 6.14 5.68–6.62 3.81 3.50–4.13 1.08 0.94–1.22 0.07 0.04–0.31 0.00 0.00–0.00
1991 0.01 0.00–0.04 0.53 0.36–0.69 1.60 1.34–1.85 2.66 2.43–2.92 2.83 2.45–3.27 7.08 6.60–7.55 8.10 7.53–8.70 7.98 7.34–8.58 5.40 4.79–6.05 3.83 3.48–4.20 1.43 1.29–1.61 1.95 1.68–2.26 0.00 0.00–0.00 0.00 0.00–0.01
1992 0.00 0.00–0.00 0.00 0.00–0.01 0.13 0.06–0.23 1.34 1.04–1.67 2.06 1.70–2.41 2.08 1.88–2.31 3.62 3.12–4.18 8.77 8.12–9.42 6.31 5.70–6.94 5.15 4.66–5.71 3.67 3.42–3.93 0.94 0.72–1.19 0.00 0.00–0.00 0.00 0.00–0.01
1993 0.00 0.00–0.00 0.00 0.00–0.00 1.54 1.21–1.88 5.36 4.99–5.79 5.81 5.29–6.37 8.85 8.27–9.52 12.14 11.44–12.81 8.10 7.42–8.75 6.04 5.59–6.55 4.55 4.09–5.14 1.87 1.68–2.06 0.27 0.18–0.37 0.00 0.00–0.02 0.00 0.00–0.00
1994 0.00 0.00–0.00 1.71 1.54–1.90 0.71 0.55–0.88 0.95 0.76–1.16 2.65 2.34–2.96 3.68 3.40–3.99 8.09 7.52–8.71 5.67 5.17–6.20 5.15 3.76–7.84 4.71 4.20–5.27 4.17 3.81–4.55 1.72 1.54–1.89 0.36 0.27–0.46 0.00 0.00–0.01
1995 0.00 0.00–0.00 0.00 0.00–0.02 0.08 0.04–0.15 1.24 0.97–1.53 3.14 2.80–3.51 3.04 2.71–3.40 5.40 4.93–5.93 10.28 9.55–11.00 2.62 2.35–2.91 3.26 2.92–3.59 3.65 3.29–4.01 1.98 1.79–2.20 0.01 0.00–0.03 0.28 0.19–0.38
1996 0.07 0.03–0.11 0.56 0.48–0.66 0.14 0.07–0.23 5.01 4.52–5.73 5.01 4.55–5.51 na na 6.98 6.45–7.57 4.77 4.40–5.14 7.51 6.93–8.15 8.50 7.82–9.29 2.11 1.83–2.45 na na 0.00 0.00–0.00 na na
1997 0.00 0.00–0.00 0.00 0.00–0.10 0.90 0.72–1.09 0.41 0.27–0.61 1.18 0.96–1.41 na na 8.83 8.25–9.38 5.22 4.68–5.76 4.71 4.22–5.26 3.65 3.36–3.99 1.46 1.27–1.64 na na 0.28 0.15–0.68 0.37 0.19–0.59
1998 0.00 0.00–0.00 1.55 1.21–1.96 2.87 2.65–3.12 2.52 2.30–2.76 5.09 4.60–5.56 na na 10.60 9.95–11.30 9.56 8.93–10.20 5.19 4.84–5.55 7.55 6.98–8.12 3.36 3.07–3.70 na na 0.00 0.00–0.00 na na
1999 0.00 0.00–0.00 0.00 0.00–0.00 0.42 0.26–0.63 1.16 0.97–1.39 4.09 3.66–4.48 na na 7.55 6.92–8.22 6.15 5.48–6.81 5.86 5.38–6.35 2.51 2.21–2.80 na na 0.11 0.06–0.18 0.00 0.00–0.01 na na
2000 0.03 0.01–0.06 0.16 0.08–0.26 3.17 2.96–3.43 5.30 4.78–5.99 4.53 4.13–4.98 0.58 0.08–3.62 6.07 5.64–6.53 6.23 5.72–6.76 5.58 5.13–6.06 3.96 3.56–4.39 1.59 1.45–1.76 na na 0.00 0.00–0.01 na na
2001 0.00 0.00–0.00 0.00 0.00–0.00 0.52 0.34–0.73 4.31 3.81–5.13 4.96 4.55–5.48 na na 5.42 4.97–5.87 4.21 3.74–4.81 3.61 3.28–3.97 3.65 3.30–4.06 3.32 2.94–3.78 0.01 0.00–0.46 0.00 0.00–0.02 0.00 0.00–0.02
2002 0.00 0.00–0.00 0.00 0.00–0.00 0.57 0.40–0.78 0.74 0.51–1.01 na na 4.96 4.47–5.50 4.62 3.21–7.05 6.74 6.28–7.25 3.19 2.84–3.56 2.48 2.16–2.89 0.18 0.01–1.35 0.74 0.60–0.90 0.00 0.00–0.01 0.00 0.00–0.00
2003 0.00 0.00–0.01 0.00 0.00–0.00 1.41 1.16–1.67 2.66 2.33–3.04 na na 7.44 6.87–8.03 13.48 12.70–14.25 5.72 5.10–6.34 5.17 4.76–5.64 8.67 8.13–9.27 2.18 1.46–3.46 0.51 0.36–0.69 0.34 0.26–0.44 0.00 0.00–0.00
2004 0.00 0.00–0.00 0.00 0.00–0.00 0.22 0.14–0.33 3.67 3.32–4.14 4.23 3.85–4.66 5.43 5.13–5.79 7.81 7.30–8.34 8.80 8.20–9.37 3.18 2.80–3.60 2.34 2.13–2.57 0.57 0.02–4.76 0.11 0.06–0.16 0.62 0.46–0.82 0.00 0.00–0.08
2005 0.00 0.00–0.00 0.67 0.48–0.84 1.01 0.86–1.15 0.99 0.79–1.31 5.39 4.90–5.86 7.68 7.07–8.39 8.11 7.50–8.73 6.95 6.26–7.71 10.11 9.34–10.86 5.88 5.42–6.38 3.35 3.05–3.74 0.57 0.16–2.79 na na 0.00 0.00–0.00
2006 0.00 0.00–0.02 0.12 0.06–0.22 0.71 0.52–0.91 1.53 1.27–1.82 4.94 4.56–5.37 4.13 3.79–4.51 4.74 4.34–5.19 7.51 6.90–8.20 5.95 5.34–6.64 3.41 3.14–3.67 na na 1.61 1.40–1.83 na na 0.01 0.00–0.03
2007 0.00 0.00–0.00 0.00 0.00–0.00 0.39 0.26–0.54 2.19 1.95–2.41 2.43 2.23–2.65 5.48 5.03–5.98 4.59 4.22–4.99 2.79 2.43–3.14 3.50 1.55–9.40 1.02 0.24–4.49 na na 0.01 0.00–0.56 0.00 0.00–0.45 0.00 0.00–0.05
2008 na na 0.00 0.00–0.07 0.00 0.00–0.29 0.45 0.00–6.72 0.84 0.08–4.68 7.12 6.30–9.90 5.50 2.29–12.08 6.80 2.97–14.21 1.52 0.30–6.34 2.02 0.79–6.36 0.59 0.00–6.44 na na na na na na
2009 0.00 0.00–0.00 0.02 0.01–0.06 0.38 0.19–0.63 1.88 1.63–2.94 5.89 4.14–8.34 5.90 4.91–7.23 7.13 6.58–7.69 3.62 3.28–4.01 4.39 4.01–4.82 7.02 6.50–7.58 0.27 0.15–0.42 1.01 0.05–7.64 0.02 0.00–1.18 0.00 0.00–0.00
2010   0.28 0.21–0.37   0.00 0.00–0.07   0.59 0.43–0.76   0.40 0.00–3.96   4.36 3.96–4.76   9.00 8.27–9.74   6.56 5.90–7.22   na na   4.19 3.85–4.62   5.01 4.56–5.50   0.38 0.00–3.57   0.65 0.54–0.78   0.00 0.00–0.11   0.00 0.00–0.00