~0.05 K/decade to both datasets still cannot explain the large disparity between two datasets at this latitude.

2. In lines 335-347, how can the uncertainty of the lower troposphere temperature record be consistent with the mid-troposphere uncertainty, especially given that the mid tropospheric record is biased low by contaminating lower stratosphere influences?

3. Section 4.3 fails to examine root mean square (RMS) differences (e.g., Hurrell et al., 2000) and only deals with average trends.

4. The surface record also has problems that are not discussed in Section 5.1 of Chapter 4. In particular, no error bars are assigned to the systematic corrections.

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